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

[Charlie Barto via llvm-commits]

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@@ -2,12 +2,18 @@
 // RUN: %clang_cl_asan %LD %Od %s %Fe%t.dll
 // RUN: not %run %t %t.dll 2>&1 | FileCheck %s
 
+#include "../defines.h"
+
 struct C {
   int x;
   ~C() {}
 };
 
-int __attribute__((noinline, optnone)) hide(int x) { return x; }
+int ATTRIBUTE_NOINLINE
+#if __clang__ || !defined(_MSC_VER)
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barcharcraz wrote:

I think this is somewhat stylistic. I can switch to defined instead of relying on the substitution of undefined identifiers for 0 though, it's a reasonable style.

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