[compiler-rt] Reland "[rtsan] Intercept aligned_alloc on all versions of OSX if available on the build machine" (PR #114153)

[Florian Mayer via llvm-commits]

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@@ -464,10 +464,13 @@ INTERCEPTOR(void *, valloc, SIZE_T size) {
 }
 
 #if SANITIZER_INTERCEPT_ALIGNED_ALLOC
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunguarded-availability-new"
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fmayer wrote:

weak function without a definition is a nullptr, so it will crash when called.

https://github.com/llvm/llvm-project/pull/114153