[llvm] [Utils] Identity map module-level debug info on first use in CloneFunction* (PR #118627)

[Felipe de Azevedo Piovezan via llvm-commits]

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@@ -899,6 +901,14 @@ std::optional<Metadata *> Mapper::mapSimpleMetadata(const Metadata *MD) {
     return wrapConstantAsMetadata(*CMD, mapValue(CMD->getValue()));
   }
 
+  // Map metadata from IdentityMD on first use. We need to add these nodes to
+  // the mapping as otherwise metadata nodes numbering gets messed up. This is
+  // still economical because the amount of data in IdentityMD may be a lot
+  // larger than what will actually get used.
+  if (IdentityMD && IdentityMD->contains(MD)) {
+    return getVM().MD()[MD] = TrackingMDRef(const_cast<Metadata *>(MD));
+  }
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felipepiovezan wrote:

[Don’t Use Braces on Simple Single-Statement Bodies of if/else/loop Statements](https://llvm.org/docs/CodingStandards.html#id60)

https://github.com/llvm/llvm-project/pull/118627