[PATCH][AArch64] Simplify ashl<mode>3 expander for SHORT modes

[Kyrill Tkachov]

Hi all,

The ashl<mode>3 expander for QI and HI modes is needlessly obfuscated.
The 2nd operand predicate accepts nonmemory_operand but the expand code
FAILs if it's not a CONST_INT. We can just demand a const_int_operand in
the predicate and remove the extra CONST_INT check.

Looking at git blame, it seems it was written that way as a result of some
other refactoring a few years back for an unrelated change.

Bootstrapped and tested on aarch64-none-linux-gnu.
Ok for trunk?

Thanks,
Kyrill

2016-04-27  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     * config/aarch64/aarch64.md (ashl<mode>3, SHORT modes):
     Use const_int_operand for operand 2 predicate.  Simplify expand code
     as a result.
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