[Patch, ARM] Fix PR53859: ICE on armv7e-m

[Greta Yorsh]

New RTL patterns generated for epilogues with RETURN (trunk r188742) are not
recognized by the pattern matching code in arm_early_load_addr_dep, which is
used for insn latency calculation when tuning for cortex-m4. It causes an
ICE when tuning for armv7e-m or cortex-m4:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53859.

The obvious fix is to detect RETURN pattern in arm_early_load_addr_dep. 

No regression on qemu.

Ok for trunk?

Thanks,
Greta

ChangeLog

2012-07-10  Greta Yorsh  <Greta.Yorsh@arm.com>

gcc/
	PR target/53859
	* config/arm/arm.c (arm_early_load_addr_dep): Handle new
	epilogue patterns.

gcc/testsuite

	PR target/53859
	* gcc.target/arm/pr53859.c: New test.
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