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Elides inttoptr casts used (exclusively) in load instructions when
PNaClVersion=2. This is an incremental start on removing the inttoptr
instruction from the PNaCl wire format (See issue 3544 for more information
on the strategy of removing ptrtoint).
Also modifies PNaCl bitcode reader/writer to accept PNaClVersion=1 as supported,
and PNaClVersion=2 as unsupported but readable (allowing pnacl-freeze and
pnacl-thaw to work on such files).
Also allows command-line option --pnacl-version for setting PNaClVersion in the
PNaCl bitcode writer.
Also fixes some problems on PNaCl bitcode headers, using common support to
determine when the read/written PNaCl bitcode file is valid.
BUG= https://code.google.com/p/nativeclient/issues/detail?id=3544
R=jvoung@chromium.org
Review URL: https://codereview.chromium.org/5812155903377408
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BUG= https://code.google.com/p/nativeclient/issues/detail?id=3405
R=jvoung@chromium.org
Review URL: https://codereview.chromium.org/14642019
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BUG= https://code.google.com/p/nativeclient/issues/detail?id=3405
Review URL: https://codereview.chromium.org/14322020
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Copy classes for LLVM BitcodeWriter into a PNaCL subdirectory, to create a
PNaCL version. Renames classes/methods to include PNaCl prefix so that they
don't conflict with the LLVM BitcodeWriter.
Also removed experimental support for use-list order
preservation.
BUG=https://code.google.com/p/nativeclient/issues/detail?id=3405
Review URL: https://codereview.chromium.org/14126011
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