[PATCH] Improve -Winvalid-noreturn

[Richard Trieu]

Aaron Ballman brought up a point on the mailing list.  CXXRecordDecl::getDestructor() can return null in some places.  This patch restructures the isAnyDestructorNoReturn() to be on the CXXRecordDecl instead of on the CXXDestructorDecl.  If the destructor does not exist, it is safe to assume it does not have the noreturn attribute.


http://reviews.llvm.org/D9454

Files:
  include/clang/AST/DeclCXX.h
  lib/AST/DeclCXX.cpp
  lib/Analysis/CFG.cpp
  test/SemaCXX/attr-noreturn.cpp

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