[PATCH][AArch64][obvious] In aarch64_class_max_nregs use UNITS_PER_VREG and UNITS_PER_WORD

[Kyrill Tkachov]

Hi all,

This patch replaces 15, 16, 7 and 8 in aarch64_class_max_nregs with the macro that they represent.
This should make the logic of that function easier to understand.

Bootstrapped and tested on aarch64.
Applying as obvious.

2015-05-20  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     * config/aarch64/aarch64.c (aarch64_class_max_nregs):
     Use UNITS_PER_VREG and UNITS_PER_WORD instead of their direct
     values.
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