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Retainer profiling broken

I tried to profile with the following flags:

foo +RTS -i0.5 -hr -hcTransformType -RTS ...

The resulting .hp file has currupt time stamps. Here they are:

BEGIN_SAMPLE 0.00
BEGIN_SAMPLE 0.79
BEGIN_SAMPLE 1.38
BEGIN_SAMPLE 1.65
BEGIN_SAMPLE 1.31
BEGIN_SAMPLE 0.4294967237
BEGIN_SAMPLE 4294967294.4294967266
BEGIN_SAMPLE 4294967294.4294967266
BEGIN_SAMPLE 4294967294.4294967291
BEGIN_SAMPLE 4294967295.4294967212
BEGIN_SAMPLE 4294967295.4294967220
BEGIN_SAMPLE 4294967295.4294967223
BEGIN_SAMPLE 4294967295.4294967225
BEGIN_SAMPLE 4294967295.4294967217
BEGIN_SAMPLE 4294967295.4294967206
BEGIN_SAMPLE 4294967295.4294967264
Trac metadata
Trac field Value
Version 7.2.1
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Profiling
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture
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