[clang] [ASAN] For Asan instrumented global, emit two symbols, one with actual size and other with instrumented size. (PR #70166)

[via cfe-commits]

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@@ -758,6 +758,19 @@ void AsmPrinter::emitGlobalVariable(const GlobalVariable 
*GV) {
   // sections and expected to be contiguous (e.g. ObjC metadata).
   const Align Alignment = getGVAlignment(GV, DL);
 
+  // Identify globals with "asan_instrumented" attribute and extract
+  // the actual global variable size.
+  uint64_t ActualSize = 0;
+  if (GV->hasAttribute(Attribute::SanitizeAddress)) {
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skc7 wrote:

This would be replaced by "asan_instrumented" attributes, once #68865 gets 
approved and merged.

https://github.com/llvm/llvm-project/pull/70166
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