[PATCH][GCC][ARM] Ensure dotproduct is only enabled on armv8 neon

[PATCH][GCC][ARM] Ensure dotproduct is only enabled on armv8 neon

gcc/ChangeLog:

2018-11-30  Sam Tebbs<sam.tebbs@arm.com>

	* config/arm/arm.h (TARGET_DOTPROD): Add TARGET_VFP5 constraint.

gcc/testsuite/ChangeLog:

2018-11-30  Sam Tebbs<sam.tebbs@arm.com>

	* gcc.target/arm/neon-dotprod-restriction.c: New file.
	* lib/target-supports.exp
	(check_effective_target_arm_v8_2a_dotprod_neon_ok_nocache): Include
	stdint.h.

From-SVN: r266665