[PATCH][GAS][ARM] Implement yield, wfe, wfi and sev assembly instructions for ARMv6T2.

[Srinath Parvathaneni]

Hi All,

This patch implements the assembly instructions yield, wfe, wfi and sev
for ARMv6T2 in both ARM mode and Thumb mode.
These instructions executes as NOP for ARMv6T2, please refer these
instructions documented in the ArmARM[1]

[1]
http://arminfo.emea.arm.com/help/topic/com.arm.doc.ddi0406c.d/DDI0406C_d_armv7ar_arm.pdf

Bootstrapped on arm-none-linux-gnueabihf and regression tested on
arm-none-eabi with no regressions.

Ok for trunk? If ok, could someone commit the patch on my behalf, I
don't have commit rights.

Thanks,
Srinath.

gas/ChangeLog:

2019-01-10  Srinath Parvathaneni <srinath.parvathaneni@arm.com>

	* config/tc-arm.c (arm_ext_v6k_v6t2): Define.
	(insns) [ARM_VARIANT]: Modified.
	(insns) [THUMB_VARIANT]: To implement few ARMv6K instructions
	in ARMv6T2 as well.
	* testsuite/gas/arm/archv6t2-1.d: New test.
	* testsuite/gas/arm/archv6t2-1.s: Likewise.
	* testsuite/gas/arm/archv6t2-2.d: Likewise.





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