arm-protos.h: Add and update function protos.

gcc/ChangeLog:
2013-05-30  Bernd Schmidt  <bernds@codesourcery.com>
	    Zhenqiang Chen  <zhenqiang.chen@linaro.org>

	* config/arm/arm-protos.h: Add and update function protos.
	* config/arm/arm.c (use_simple_return_p): New added.
	(thumb2_expand_return): Check simple_return flag.
	* config/arm/arm.md: Add simple_return and conditional simple_return.
	* config/arm/iterators.md: Add iterator for return and simple_return.

gcc/testsuite/ChangeLog:
2013-05-30  Zhenqiang Chen  <zhenqiang.chen@linaro.org>

	* gcc.dg/shrink-wrap-alloca.c: New added.
	* gcc.dg/shrink-wrap-pretend.c: New added.
	* gcc.dg/shrink-wrap-sibcall.c: New added.

From-SVN: r199439