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

[via llvm-commits]

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@@ -3917,6 +3935,13 @@ Error BitcodeReader::parseGlobalVarRecord(ArrayRef<uint64_t> Record) {
     NewGV->setSanitizerMetadata(Meta);
   }
 
+  if (Record.size() > 17 && Record[17]) {
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heiher wrote:

Currently, 0 meanings invalid (indicating that no code model is explicitly specified for global).  Is it enough to handle it correctly based on the record size and value? It would be great to have an example if I understand wrong.

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