The ACLE intrinsics introduced to support the ARMv8.2 FP16 extensions
require that intrinsics for scalar (VFP) instructions are available
under different conditions from those for the NEON intrinsics. To
support this, changes to the builtins support code are needed to enable
the scalar intrinsics to be initialized and expanded independently of
the NEON intrinsics.

This patch prepares for this by refactoring some of the builtin support
code so that it can be used for both the scalar and the NEON intrinsics.

Tested the series for arm-none-linux-gnueabihf with native bootstrap and
make check and for arm-none-eabi and armeb-none-eabi with make check on
an ARMv8.2-A emulator.

Ok for trunk?
Matthew

2016-05-17  Matthew Wahab  <matthew.wahab@arm.com>

	* config/arm/arm-builtins.c (ARM_BUILTIN_NEON_PATTERN_START):
	Change offset calculation.
	(arm_init_neon_builtin): New.
	(arm_init_builtins): Move body of a loop to the standalone
	function arm_init_neon_builtin.
	(arm_expand_neon_builtin_1): New.  Update comment.  Function body
	moved from arm_expand_neon_builtin with some white-space fixes.
	(arm_expand_neon_builtin): Move code into the standalone function
	arm_expand_neon_builtin_1.