[Aarch64, Patch] Update failing testcase pr62178.c

[Jackson Woodruff <jackson dot woodruff at foss dot arm dot com>]

Hi all,

This patch changes pr62178.c so that it now scans
for two `ldr`s, one into an `s` register, instead
of a `ld1r` as before. Also add a scan for an mla
instruction.

The `ld1r` was needed when this should have generated
a mla by vector. Now that we can generate an mla by
element instruction and can load directly into the
simd register, it is cheaper to not do the ld1r
which needlessly duplicates the single element used
across the whole vector register.

The testcase passes now that 
https://gcc.gnu.org/ml/gcc-patches/2017-08/msg00048.html has been committed

OK for trunk?

Jackson

ChangeLog:
gcc/testsuite

2017-09-13  Jackson Woodruff  <jackson.woodruff@arm.com>

	* gcc.target/aarch64/pr62178.c: Updated testcase
	to scan for two ldrs and an mla.

Attachment: patchfile
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