[clang] [llvm] [TLI] Add support for reallocarray (PR #114818)

[Matt Arsenault via cfe-commits]

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@@ -852,6 +852,7 @@ static void initializeLibCalls(TargetLibraryInfoImpl &TLI, const Triple &T,
     TLI.setUnavailable(LibFunc_memrchr);
     TLI.setUnavailable(LibFunc_ntohl);
     TLI.setUnavailable(LibFunc_ntohs);
+    TLI.setUnavailable(LibFunc_reallocarray);
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arsenm wrote:

I mean this needs to be documented in the code, not the commit message 

https://github.com/llvm/llvm-project/pull/114818