ARM: allow misaligned local variables in Thumb1 mode.

There's no hard requirement on LLVM to align local variable to 32-bits, so the
Thumb1 frame handling needs to be able to deal with variables that are only
naturally aligned without falling over.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219733 91177308-0d34-0410-b5e6-96231b3b80d8
ARM: remove ARM/Thumb distinction for preferred alignment.

Thumb1 has legitimate reasons for preferring 32-bit alignment of types
i1/i8/i16, since the 16-bit encoding of "add rD, sp, #imm" requires #imm to be
a multiple of 4. However, this is a trade-off betweem code size and RAM usage;
the DataLayout string is not the best place to represent it even if desired.

So this patch removes the extra Thumb requirements, hopefully making ARM and
Thumb completely compatible in this respect.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219734 91177308-0d34-0410-b5e6-96231b3b80d8
MC: Rewrite bigobj test in python

This makes the test easier to work with.  No functionality change
intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219737 91177308-0d34-0410-b5e6-96231b3b80d8
[X86][SSE] pslldq/psrldq shuffle mask decodes

Patch to provide shuffle decodes and asm comments for the sse pslldq/psrldq SSE2/AVX2 byte shift instructions.

Differential Revision: http://reviews.llvm.org/D5598


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219738 91177308-0d34-0410-b5e6-96231b3b80d8
MC, COFF: Make bigobj test compatible with python3

No functionality change intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219739 91177308-0d34-0410-b5e6-96231b3b80d8