[compiler-rt] [rtsan] Introduce function-name-is suppression (PR #112108)

[via llvm-commits]

================
@@ -17,3 +17,4 @@
 // SummaryKind should be a string literal.
 
 RTSAN_CHECK(CallStackContains, "call-stack-contains")
+RTSAN_CHECK(FunctionNameIs, "function-name-is")
----------------
davidtrevelyan wrote:

I like `function-name-is` if the intention is only to allow users to provide an exact function name match, character for character. But I think that would be difficult to use - how is the user supposed to reason about namespaces, mangling, parentheses on the end, overloads, etc.? I think at the minute I prefer `function-name-matches` with regex supported. 

https://github.com/llvm/llvm-project/pull/112108