Fix event message in withTiming'

This typo caused generating 'end' events without the corresponding 'begin' events.
36 jobs for master in 407 minutes and 15 seconds (queued for 3 seconds)
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nightly-x86_64-windows Full Build
Git branch:   12-9-stable
GO version: go1.13.8
Built: 2020-03-20T13:02:39+0000
OS/Arch: windows/amd64
Uploading artifacts...
Runtime platform
arch=amd64 os=windows pid=5160 revision=4c96e5ad version=12.9.0
WARNING: junit.xml: no matching files
ERROR: No files to upload
ERROR: Job failed: exit status 1
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validate-x86_64-windows Full Build
Git branch:   12-9-stable
GO version: go1.13.8
Built: 2020-03-20T13:02:39+0000
OS/Arch: windows/amd64
Uploading artifacts...
Runtime platform
arch=amd64 os=windows pid=5620 revision=4c96e5ad version=12.9.0
WARNING: junit.xml: no matching files
ERROR: No files to upload
ERROR: Job failed: exit status 1
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nightly-x86_64-linux-deb9-integer-simple Full Build
Uploading artifacts...
./ghc-x86_64-deb9-linux.tar.xz: found 1 matching files
junit.xml: found 1 matching files

performance-metrics.tsv: found 1 matching files

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id=287313 responseStatus=201 Created token=RkdyazmJ
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junit.xml: found 1 matching files

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id=287313 responseStatus=201 Created token=RkdyazmJ
ERROR: Job failed: exit code 1
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nightly-aarch64-linux-deb9 Full Build
Uploading artifacts...
ghc-aarch64-linux-deb9.tar.xz: found 1 matching files
junit.xml: found 1 matching files

performance-metrics.tsv: found 1 matching files

Uploading artifacts to coordinator... ok
id=287304 responseStatus=201 Created token=KzqQx-Ta
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junit.xml: found 1 matching files

Uploading artifacts to coordinator... ok
id=287304 responseStatus=201 Created token=KzqQx-Ta
ERROR: Job failed: exit code 1
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validate-aarch64-linux-deb9 Full Build
Uploading artifacts...
ghc-aarch64-linux-deb9.tar.xz: found 1 matching files
junit.xml: found 1 matching files

performance-metrics.tsv: found 1 matching files

Uploading artifacts to coordinator... ok
id=287303 responseStatus=201 Created token=s9Akz5dB
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junit.xml: found 1 matching files

Uploading artifacts to coordinator... ok
id=287303 responseStatus=201 Created token=s9Akz5dB
ERROR: Job failed: exit code 1
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nightly-i386-windows Full Build
Git branch:   12-9-stable
GO version: go1.13.8
Built: 2020-03-20T13:02:39+0000
OS/Arch: windows/amd64
Uploading artifacts...
Runtime platform
arch=amd64 os=windows pid=6804 revision=4c96e5ad version=12.9.0
WARNING: junit.xml: no matching files
ERROR: No files to upload
ERROR: Job failed: exit status 1
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nightly-x86_64-linux-deb9-llvm Full Build
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WARNING: ./ghc-x86_64-deb9-linux.tar.xz: no matching files
WARNING: junit.xml: no matching files
WARNING: performance-metrics.tsv: no matching files
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WARNING: junit.xml: no matching files
ERROR: No files to upload
ERROR: Job failed: exit code 1
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nightly-x86_64-linux-alpine Full Build
Running rm -Rf _build...
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ghc.tar.xz: found 1 matching files
junit.xml: found 1 matching files

Uploading artifacts to coordinator... ok
id=287316 responseStatus=201 Created token=osjqdQXT
Uploading artifacts...
junit.xml: found 1 matching files

Uploading artifacts to coordinator... ok
id=287316 responseStatus=201 Created token=osjqdQXT
ERROR: Job failed: exit code 1
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nightly-x86_64-freebsd Full Build
WARNING: ghc-x86_64-portbld-freebsd.tar.xz: no matching files 
WARNING: junit.xml: no matching files
WARNING: performance-metrics.tsv: no matching files
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Runtime platform
arch=amd64 os=freebsd pid=13204 revision=58272c27 version=12.7.0
WARNING: junit.xml: no matching files
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ERROR: Job failed: exit status 1
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nightly-i386-windows-hadrian Full Build
Git branch:   12-6-stable
GO version: go1.13.4
Built: 2019-12-22T11:55:34+0000
OS/Arch: windows/amd64
Uploading artifacts...
Runtime platform
arch=amd64 os=windows pid=6912 revision=ac8e767a version=12.6.0
WARNING: junit.xml: no matching files
ERROR: No files to upload
ERROR: Job failed: exit status 1
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validate-x86_64-windows-hadrian Full Build
Git branch:   12-9-stable
GO version: go1.13.8
Built: 2020-03-20T13:02:39+0000
OS/Arch: windows/amd64
Uploading artifacts...
Runtime platform
arch=amd64 os=windows pid=6924 revision=4c96e5ad version=12.9.0
WARNING: junit.xml: no matching files
ERROR: No files to upload
ERROR: Job failed: exit status 1
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validate-i386-windows Full Build
Git branch:   12-4-stable
GO version: go1.10.8
Built: 2019-10-28T12:49:51+0000
OS/Arch: windows/amd64
Uploading artifacts...
Runtime platform
arch=amd64 os=windows pid=3496 revision=05161b14 version=12.4.1
WARNING: junit.xml: no matching files
ERROR: No files to upload
ERROR: Job failed: exit status 1