llvm-project

a042fcbe - [clang] Bailout when the substitution of template parameter mapping is invalid. (#86869)

[clang] Bailout when the substitution of template parameter mapping is invalid. (#86869) Fixes #86757 We missed to handle the invalid case when substituting into the parameter mapping of an constraint during normalization. The constructor of `InstantiatingTemplate` will bail out (no `CodeSynthesisContext` will be added to the instantiation stack) if there was a fatal error, consequently we should stop doing any further template instantiations.