[llvm] [llvm][IR] Add per-global code model attribute (PR #72077)

[Arthur Eubanks via llvm-commits]

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@@ -124,6 +129,28 @@ class GlobalObject : public GlobalValue {
   /// appropriate default object file section.
   void setSection(StringRef S);
 
+  /// Get the custom code model raw value of this global.
+  ///
+  unsigned getCodeModelRaw() const {
+    unsigned Data = getGlobalValueSubClassData();
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aeubanks wrote:

was going to ask that this protect against extra bits, but I see that we already have an assert in `setCodeModel()`

https://github.com/llvm/llvm-project/pull/72077