[PATCH] Fix for big-endian gcc.c-torture/execute/pr55750.c

[Kyrill Tkachov]

Hi all,

I noticed that my patch for PR tree-optimization/78170 broke execute.exp=pr55750.c on big-endian.
The problem with that patch is that we should not forget to clear the padding bits in the temporary
buffer when merging values even when they are less than a byte.

Tested on aarch64_be-none-elf (the test failure goes away)
Bootstrap and test on x86_64 ongoing.
Ok for trunk if successful?

David, does this patch allow AIX bootstrap to proceed by any chance?

Thanks,
Kyrill

2016-11-02  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     * gimple-ssa-store-merging.c (encode_tree_to_bitpos): Don't forget to
     clear padding bits even when they're less than a byte.
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