[PATCH] Use proper opcodes in SP updates for x32

[Eli Bendersky]

Hello,

This is the next patch in the x32 ABI series.

It makes sure the correct opcodes are used to SUB and ADD the stack
pointer in function prologs/epilogs. The opcodes should depend on the
data model (LP64 vs. ILP32) rather than the architecture bit-ness.
Test included.

Please review,

Eli
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