[PATCH] Add -Wrange-loop-analysis to warn when a range-based for-loop is creating a copy.

[Richard Trieu]

http://reviews.llvm.org/D4169

Files:
  include/clang/Basic/DiagnosticGroups.td
  include/clang/Basic/DiagnosticSemaKinds.td
  lib/Sema/SemaStmt.cpp
  test/SemaCXX/warn-range-loop-analysis.cpp
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