Amend r343442, by only expecting the lib.msun.cbrt_test.cbrtl_powl and
trig_test.reduction test cases to fail, if the fixes from r343916 have
not yet been applied to the base compiler.

Reported by: lwhsu
PR: 234040
Upstream PR: https://bugs.llvm.org/show_bug.cgi?id=40206
MFC after: 1 week