Tests for stage1 are failing

The tests for stage1 are failing. The builds shouldn't be green.

Example: merge request !7401 (closed), jobs validate-x86_64-darwin, validate-x86_64-linux-deb10-hadrian, validate-x86_64-linux-deb10-unreg-hadrian.

If you search for "unexpected results", you'll see stage1 tests:

Compile failed (exit code 127) errors were:
/bin/sh: 1: /builds/ghc/ghc/_build/stage1-test/bin/ghc: not found
*** unexpected failure for T2632(normal)
Compile failed (exit code 127) errors were:
/bin/sh: 1: /builds/ghc/ghc/_build/stage1-test/bin/ghc: not found
*** unexpected failure for T13609(normal)

Unexpected results from:
TEST="T13609 T2632"

SUMMARY for test run started at Tue Feb  8 12:28:07 2022 
0:00:00.066108 spent to go through
       2 total tests, which gave rise to
       8 test cases, of which
       6 were skipped
       ...
       2 unexpected failures