[PATCH] PR20958 Allow redeclaration of type-generic builtins

[Charlie Turner]

Handle `signbit` as well.


http://reviews.llvm.org/D9912

Files:
  include/clang/Basic/Builtins.def
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Sema/Sema.h
  lib/AST/ASTContext.cpp
  lib/Sema/SemaDecl.cpp
  test/Sema/builtins-c89-valid.c
  test/Sema/builtins-c99-generic.c
  test/SemaCXX/builtins.cpp

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