[PATCH] Add warnings so that Clang can catch most of the cases that GCC's -Waddress can catch

[Richard Trieu]

  Address David Majnemer's comments.

http://llvm-reviews.chandlerc.com/D2645

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2645?vs=7194&id=7233#toc

Files:
  test/Analysis/stackaddrleak.c
  test/Analysis/casts.c
  test/Analysis/ptr-arith.c
  test/Analysis/weak-functions.c
  test/Sema/static-init.c
  test/Sema/const-eval.c
  test/CXX/expr/expr.unary/expr.unary.op/p6.cpp
  test/CXX/dcl.decl/dcl.init/dcl.init.list/p7-cxx11-nowarn.cpp
  test/CXX/dcl.decl/dcl.init/dcl.init.list/p7-0x.cpp
  test/SemaCXX/nullptr_in_arithmetic_ops.cpp
  test/SemaCXX/warn-tautological-compare.cpp
  test/SemaCXX/constant-expression-cxx11.cpp
  test/SemaCXX/warn-func-as-bool.cpp
  test/SemaCXX/null_in_arithmetic_ops.cpp
  test/SemaCXX/warn-bool-conversion.cpp
  test/SemaTemplate/resolve-single-template-id.cpp
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Basic/DiagnosticGroups.td
  include/clang/Sema/Sema.h
  lib/Sema/SemaChecking.cpp
  lib/Sema/SemaExpr.cpp
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