This is the modified version of the second of my Aarch64 SIMD ABI patches.
While implementing this functionality I found I wanted
targetm.simd_clone.adjust to be called when creating SIMD clone definitions
and also when creating SIMD clone declarations.  The current
implementation (used only by x86) only called this target function when
creating clone definitions.  I added a second argument to the target
function to say if it was creating a definition or a declaration and
modified the i386 code to do nothing on declarations, thus maintaining
its current behavour.

This allowed my to add the aarch64_vector_pcs attribute to SIMD clone
declarations and definitions on Aarch64. 

I considered comparing node->decl and cfun->decl to differentiate
between definitions and declarations instead of using a new argument
but having an argument seemed cleaner and clearer.

Tested on x86 and aarch64.

Steve Ellcey
sellcey@marvell.com


2018-12-11  Steve Ellcey  <sellcey@cavium.com>

	* config/aarch64/aarch64.c (cgraph.h): New include.
	(aarch64_simd_clone_compute_vecsize_and_simdlen): New function.
	(aarch64_simd_clone_adjust): Ditto.
	(aarch64_simd_clone_usable): Ditto.
	(TARGET_SIMD_CLONE_COMPUTE_VECSIZE_AND_SIMDLEN): New macro.
	(TARGET_SIMD_CLONE_ADJUST): Ditto.
	(TARGET_SIMD_CLONE_USABLE): Ditto.
	* config/i386/i386.c (ix86_simd_clone_adjust): Add new argument.
	* omp-simd-clone.c (simd_clone_adjust): Add new argument
	to targetm.simd_clone.adjust call.
	(expand_simd_clones): Add new targetm.simd_clone.adjust call.
	* target.def (simd_clone_adjust): Add new argument.