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from b8333ea1b7 [Preamble] Empty preamble is not an error. new 0e6cfa4e8a [CodeGen] Merge identical block descriptor global variables.

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Summary of changes: lib/CodeGen/CGBlocks.cpp | 403 ++++++++++++++------- lib/CodeGen/CGBlocks.h | 3 + lib/CodeGen/CGObjCMac.cpp | 59 ++- lib/CodeGen/CGObjCRuntime.h | 4 + test/CodeGenCXX/blocks.cpp | 12 +- test/CodeGenObjC/arc-blocks.m | 13 +- .../arc-captured-32bit-block-var-layout-2.m | 3 +- test/CodeGenObjC/fragile-arc.m | 4 +- test/CodeGenObjC/noescape.m | 6 +- 9 files changed, 359 insertions(+), 148 deletions(-)