[clang] [llvm] [MTE] Add an attribute to opt-in memory tagging of global variables while using fsanitize=memtag-globals (#166380) (PR #168535)

[Florian Mayer via llvm-commits]

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@@ -28,6 +29,11 @@ void func() {
 // This DOES NOT mean we are instrumenting the section global,
 // but we are ignoring it in AsmPrinter rather than in clang.
 // CHECK:     @{{.*}}section_global{{.*}} ={{.*}} sanitize_memtag
+
+// In order to opt-in memory tagging in globals in sections,
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fmayer wrote:

maybe also add to memtag-globals-asm.cpp?

https://github.com/llvm/llvm-project/pull/168535