Nightly Dotty workflow of 2022-01-20 failed

[github-actions]

See https://github.com/lampepfl/dotty/actions/runs/1721400266

[som-snytt]

L1652 test_windows_full

[info] Test dotty.tools.dotc.CompilationTests.negAll started
Fatal compiler crash when compiling: tests\neg\forwardCompat-nestedSumMirror:
Cannot run program "C:\Windows\ServiceProfiles\NetworkService\.cache\dotty\test\compilers\scala3-3.0.2/bin/scalac": CreateProcess error=193, %1 is not a valid Win32 application
java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
java.lang.Runtime.exec(Runtime.java:621)
java.lang.Runtime.exec(Runtime.java:486)
dotty.tools.vulpix.ParallelTesting$Test.compileWithOtherCompiler(ParallelTesting.scala:539)
dotty.tools.vulpix.ParallelTesting$CompilationLogic.compileTestSource$$anonfun$1$$anonfun$1(ParallelTesting.scala:222)
scala.collection.immutable.List.map(List.scala:250)
dotty.tools.vulpix.ParallelTesting$CompilationLogic.compileTestSource$$anonfun$1(ParallelTesting.scala:222)
scala.util.Try$.apply(Try.scala:210)
dotty.tools.vulpix.ParallelTesting$CompilationLogic.dotty$tools$vulpix$ParallelTesting$CompilationLogic$$compileTestSource(ParallelTesting.scala:223)
dotty.tools.vulpix.ParallelTesting$$anon$5.checkTestSource$$anonfun$1(ParallelTesting.scala:269)
dotty.tools.vulpix.ParallelTesting$Test.tryCompile(ParallelTesting.scala:437)
dotty.tools.vulpix.ParallelTesting$$anon$5.checkTestSource(ParallelTesting.scala:272)
dotty.tools.vulpix.ParallelTesting$Test$LoggedRunnable.run(ParallelTesting.scala:340)
dotty.tools.vulpix.ParallelTesting$Test$LoggedRunnable.run$(ParallelTesting.scala:322)
dotty.tools.vulpix.ParallelTesting$$anon$5.run(ParallelTesting.scala:267)