[Patch][gas][arm] Set context table for '.arch_extension'

[Vladimir Murzin]

This patch fixes .arch_extension behaviour.

Currently, context table for '.arch_extension' is only set while
"-march" processing, but it is not set while .arch processing,
so following code is rejected

.syntax unified
.thumb
.arch armv8.1-m.main
.arch_extension mve.fp

unless -march=armv8.1-m.main is given.

gas/ChangeLog:

2019-11-27  Vladimir Murzin <vladimir.murzin@arm.com>

	* config/tc-arm.c (s_arm_arch): Set selected_ctx_ext_table.
	* gas/testsuite/gas/arm/mve-arch-ext.s: New.
	* gas/testsuite/gas/arm/mve-arch-ext.d: New.

Build and regression tests all pass on arm-none-elf and arm-wince-pe

Ok for trunk?
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