[clang] [Clang] Drop workaround for old gcc versions (PR #78803)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Yuxuan Chen (yuxuanchen1997)

<details>
<summary>Changes</summary>

This workaround existed due to https://gcc.gnu.org/PR56135. The website says that the bug was fixed in GCC 4.8.0 and the latest host toolchain requirement says GCC 7.4. I think it would be very safe to drop this workaround. 

---
Full diff: https://github.com/llvm/llvm-project/pull/78803.diff


1 Files Affected:

- (modified) clang/lib/Sema/TreeTransform.h (+2-4) 


``````````diff
diff --git a/clang/lib/Sema/TreeTransform.h b/clang/lib/Sema/TreeTransform.h
index 4463904b07211bd..ca76f68e7303f05 100644
--- a/clang/lib/Sema/TreeTransform.h
+++ b/clang/lib/Sema/TreeTransform.h
@@ -6081,11 +6081,10 @@ QualType
 TreeTransform<Derived>::TransformFunctionProtoType(TypeLocBuilder &TLB,
                                                    FunctionProtoTypeLoc TL) {
   SmallVector<QualType, 4> ExceptionStorage;
-  TreeTransform *This = this; // Work around gcc.gnu.org/PR56135.
   return getDerived().TransformFunctionProtoType(
       TLB, TL, nullptr, Qualifiers(),
       [&](FunctionProtoType::ExceptionSpecInfo &ESI, bool &Changed) {
-        return This->getDerived().TransformExceptionSpec(
+        return this->getDerived().TransformExceptionSpec(
             TL.getBeginLoc(), ESI, ExceptionStorage, Changed);
       });
 }
@@ -13637,11 +13636,10 @@ TreeTransform<Derived>::TransformLambdaExpr(LambdaExpr *E) {
     auto TransformFunctionProtoTypeLoc =
         [this](TypeLocBuilder &TLB, FunctionProtoTypeLoc FPTL) -> QualType {
       SmallVector<QualType, 4> ExceptionStorage;
-      TreeTransform *This = this; // Work around gcc.gnu.org/PR56135.
       return this->TransformFunctionProtoType(
           TLB, FPTL, nullptr, Qualifiers(),
           [&](FunctionProtoType::ExceptionSpecInfo &ESI, bool &Changed) {
-            return This->TransformExceptionSpec(FPTL.getBeginLoc(), ESI,
+            return this->TransformExceptionSpec(FPTL.getBeginLoc(), ESI,
                                                 ExceptionStorage, Changed);
           });
     };

``````````

</details>


https://github.com/llvm/llvm-project/pull/78803