[PATCH][GCC][AARCH64] PR target/90712 Fix gcc.dg/rtl/aarch64/subs_adds_sp.c regression

[Sam Tebbs]

Hi all,

This patch fixes the regression to gcc.dg/rtl/aarch64/subs_adds_sp.c that
r271735 caused. This was done by ensuring that the current function's 
frame has
been laid out before checking if return address signing is enabled.

Tested and built on aarch64-none-elf and aarch64-none-linux-gnu.

OK for trunk?

Sam Tebbs

gcc/
2019-06-20  Sam Tebbs<sam.tebbs@arm.com>

	PR target/90712
	* aarch64/aarch64.c (aarch64_post_cfi_startproc): Replace thunk check
	with a frame laid out check.

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