[llvm] [llvm] don't merge constants with COMDAT (PR #192477)

[Alexis Engelke via llvm-commits]

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@@ -85,6 +85,7 @@ isUnmergeableGlobal(GlobalVariable *GV,
   // Only process constants with initializers in the default address space.
   return !GV->isConstant() || !GV->hasDefinitiveInitializer() ||
          GV->getType()->getAddressSpace() != 0 || GV->hasSection() ||
+         GV->hasComdat() ||
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aengelke wrote:

Add brief comment to explain why.

https://github.com/llvm/llvm-project/pull/192477