[compiler-rt] [llvm] [msan] Add interceptors for fortified memory functions (__memcpy_chk, etc.) (PR #206702)

[Austin Schuh via llvm-commits]

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@@ -1822,6 +1905,10 @@ void InitializeInterceptors() {
   MSAN_MAYBE_INTERCEPT_FREAD_UNLOCKED;
   INTERCEPT_FUNCTION(memccpy);
   MSAN_MAYBE_INTERCEPT_MEMPCPY;
+  MSAN_MAYBE_INTERCEPT___MEMCPY_CHK;
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AustinSchuh wrote:

Yea, I want to delegate to `__memcpy_chk` ultimately to preserve the security checks from `_FORTIFY_SOURCE`.  The implementation to do that should be pretty much the same, just a different destination function.

https://github.com/llvm/llvm-project/pull/206702