[clang] [ASAN] Adjust asan instrumented GlobalVariable size to not include redzone (PR #66666)

[via cfe-commits]

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@@ -2445,6 +2445,11 @@ bool ModuleAddressSanitizer::InstrumentGlobals(IRBuilder<> &IRB, Module &M,
     // zero so we can copy the metadata over as is.
     NewGlobal->copyMetadata(G, 0);
 
+    // Set sanitizer metadata for newly created global,
+    // if it doesn't have it.
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b-sumner wrote:

Should we comment here that this may be a workaround for metadata lost between front end and this instrumentation pass?

https://github.com/llvm/llvm-project/pull/66666