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[AArch64][PR65139] use clobber with match_scratch for aarch64_lshr_sisd_or_int_<mode>3


This patch uses clobber with match_scratch instead of earlyclobber for
aarch64_lshr_sisd_or_int_<mode>3 so that RA can have more freedom in
selecting suitable register, as discussed in
http://thread.gmane.org/gmane.comp.gcc.patches/336162 and reported in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65139.

This is based on Maxim's patch. I have bootstrapped and regression
tested on aarch64-linux-gnu with no new regressions. Is this OK for trunk?

Thanks,
Kugan

gcc/ChangeLog:

2015-04-15  Kugan Vivekanandarajah  <kuganv@linaro.org>
	    Maxim Kuvyrkov  <maxim.kuvyrkov@linaro.org>

	PR target/65139
	* config/aarch64/aarch64.md (<optab><mode>3): Expand lshr with
	 gen_aarch64_lshr_sisd_or_int_<mode>3.
	(*aarch64_lshr_sisd_or_int_<mode>3): Rename to
	 aarch64_lshr_sisd_or_int_<mode>3 and use clobber with
	 match_scratch instead of early clobber.

Attachment: p.txt
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