[clang] [compiler-rt] Fix "[clang][UBSan] Add implicit conversion check for bitfields" (PR #87761)

[Axel Lundberg via cfe-commits]

Zonotora wrote:

@vitalybuka  Well, this is awkward, fails due to:

https://lab.llvm.org/buildbot/#/builders/127/builds/64260
C:\b\slave\sanitizer-windows\llvm-project\compiler-rt\test\ubsan\TestCases\ImplicitConversion\bitfield-conversion.c:36:3: error: unknown type name '_Bool'

Some other testcases failing as well. Seems to be flaky, no?

https://github.com/llvm/llvm-project/pull/87761