[PATCH] Force a load when creating a reference to a temporary copied from a bitfield.

[Jordan Rose]

  - Use new initialization step `SK_LValueToRValue` instead of a heavyweight implicit conversion.
  - Remove workaround for the old behavior from CodeGen.

Hi doug.gregor, rsmith,

http://llvm-reviews.chandlerc.com/D651

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D651?vs=1592&id=1593#toc

Files:
  include/clang/Sema/Initialization.h
  lib/AST/ExprConstant.cpp
  lib/CodeGen/CGExpr.cpp
  lib/Sema/SemaInit.cpp
  test/Analysis/reference.cpp
  test/CXX/dcl.decl/dcl.init/dcl.init.ref/p5-0x.cpp
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