[compiler-rt] [compiler-rt][windows] Test fixups for MSVC. (PR #109887)

[Vitaly Buka via llvm-commits]

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@@ -2,6 +2,7 @@
 // RUN: %clangxx_asan -O3 -mllvm -asan-instrument-dynamic-allocas %s -o %t
 // RUN: %run %t 2>&1
 //
+// UNSUPPORTED: MSVC
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vitalybuka wrote:

It would be nice to comment each XFAIL and UNSUPPORTED with a reason.

https://github.com/llvm/llvm-project/pull/109887