[clang] [clang] Add missing readonly/readnone annotations (PR #158424)

[Mikael Holmen via cfe-commits]

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@@ -3011,6 +3016,27 @@ void CodeGenModule::ConstructAttributeList(StringRef Name,
   }
   assert(ArgNo == FI.arg_size());
 
+  ArgNo = 0;
+  if (AddedPotentialArgAccess && MemAttrForPtrArgs) {
+    llvm::FunctionType *FunctionType = FunctionType =
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mikaelholmen wrote:

Hi @qchateau 

gcc warns on the extra ```FunctionType =``` here that I suppose should be removed:
```
../llvm-project/clang/lib/CodeGen/CGCall.cpp:3021:53: warning: operation on 'FunctionType' may be undefined [-Wsequence-point]
 3021 |     llvm::FunctionType *FunctionType = FunctionType =
      |                                        ~~~~~~~~~~~~~^
 3022 |         getTypes().GetFunctionType(FI);
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```

https://github.com/llvm/llvm-project/pull/158424