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

[Arthur Eubanks via llvm-commits]

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

this won't work if we add another GV record and we have a GV that doesn't specify an explicit code model. we need to distinguish between an invalid record value and 0

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