[PATCH] D159358: [Clang] Realize generic lambda call operators are dependent sooner

[Corentin Jabot via Phabricator via cfe-commits]

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When parsing a trailing return type / noexcept / constraint
of a generic lambda, we need to know that we are in a dependent
context. We currently don't because we only create a TemplateDecl
for the call operator one its fully parsed.

This patch attach a template decl to the call operator as soon
as the parameter declaration clause is parsed - the point at which
we  have collected all template parameters

Fixes #64689


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D159358

Files:
  clang/docs/ReleaseNotes.rst
  clang/include/clang/AST/DeclCXX.h
  clang/include/clang/Sema/Sema.h
  clang/lib/Sema/SemaLambda.cpp
  clang/lib/Sema/TreeTransform.h
  clang/test/SemaCXX/cxx2a-template-lambdas.cpp

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