[PATCH, AArch64] Skip gcc.dg/lower-subreg-1.c

[Yufeng Zhang]

Hi,

This patch changes to skip gcc.dg/lower-subreg-1.c for aarch64*-*-*. 
The word mode in aarch64 is 64-bit so the lower-subreg pass won't happen 
in this test case.  The test is currently skipped on aarch64 with lp64 
due to the directive of "dg-require-effective-target ilp32", but fails 
when -mabi=ilp32 is in use.

OK to commit?

Thanks,
Yufeng

gcc/testsuite/

	* gcc.dg/lower-subreg-1.c: Skip aarch64*-*-*.
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