d9d1ae6400
Try to fix [issue](https://github.com/llvm/llvm-project/issues/73619) 1. During transforming `FunctionProtoType`, if `ThisContext` is `nullptr` and `CurrentContext` is `ClassTemplateSpecializationDecl`, Constructor of `CXXThisScopeRAII` and `Sema::getCurrentThisType` won't set `CXXThisTypeOverride` of Sema. This will lead to building `this` in `RebuildCXXThisExpr` with a invalid type(NULL type) and cause crash. 2. During transforming attribute type, if `modifiedType` of attribute type is changed, `EquivalentType` need to be transformed. If `EquivalentType` is `FunctionProtoType`, its `ParamVarDecl` will not be copyed(but parameter num does) and will not be instanced in `TransformFunctionTypeParams` since `ParamVarDecl` is `nullptr`. This will lead to crash in `findInstantiationOf`(can't find the instance of `ParamVarDecl`). This patch tries to fix these issues above. 1. If `CurrentContext` is `ClassTemplateSpecializationDecl`, Use it. 2. Use `EquivalentTypeLoc` instead of `EquivalentType` since it has parameter info. But, if use current `TypeLocBuilder`, it will crash in `TypeLocBuilder::push` since `LastType` is mismatch. Use an auxiliary `TypeLocBuilder` instead and get transformed `EquivalentType`. Co-authored-by: huqizhi <836744285@qq.com>
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