[PATCH] Add more information when displaying a "read-only variable is not assignable" error

[Richard Trieu]

Add additional test
Rewrite the loop to display notes and stop when no new notes are needed
Fix some wording with the diagnostic

http://reviews.llvm.org/D4479

Files:
  include/clang/Basic/DiagnosticSemaKinds.td
  lib/Sema/SemaExpr.cpp
  test/CXX/temp/temp.decls/temp.mem/p5.cpp
  test/Sema/anonymous-struct-union.c
  test/Sema/block-misc.c
  test/SemaCXX/anonymous-union.cpp
  test/SemaCXX/captured-statements.cpp
  test/SemaCXX/cxx0x-constexpr-const.cpp
  test/SemaCXX/err_typecheck_assign_const.cpp
  test/SemaCXX/err_typecheck_assign_const_filecheck.cpp
  test/SemaCXX/function-type-qual.cpp
  test/SemaObjC/arc.m
  test/SemaTemplate/dependent-type-identity.cpp
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