[PATCH] D145034: [Clang][Sema] Preparations to fix handling of out-of-line definitions of constrained templates

[Alexander Shaposhnikov via Phabricator via cfe-commits]

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This diff starts fixing our handling of out-of-line definitions of constrained templates.
Initially it was motivated by https://github.com/llvm/llvm-project/issues/49620 .
The current diff doesn't fully address those issues, more changes are required to make things work for the case where
multiple template parameter lists are attached to the declaration, this will be done in a follow-up diff.

Test plan:
1/ ninja check-all 
2/ Bootstrapped Clang passes all the tests
3/ Internal testing (built a few large projects (that use templates extensively) with the bootstrapped version of Clang)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D145034

Files:
  clang/include/clang/Sema/DeclSpec.h
  clang/lib/Parse/ParseDecl.cpp
  clang/lib/Parse/ParseDeclCXX.cpp
  clang/lib/Sema/SemaCXXScopeSpec.cpp
  clang/test/CXX/temp/temp.decls/temp.class.spec/temp.class.spec.mfunc/p1-neg.cpp
  clang/test/SemaTemplate/concepts-out-of-line-def.cpp

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