Most armv7-a implementations support a number of basic extensions to
the architecture which are not particularly important to the compiler,
but can matter if code contains inline assembly.  This patch adds
support for these extensions, based on the capabilities that GAS
already provides for the appropriate CPUs.  For the purposes of
multilib selection we ignore these extensions entirely and map the
extended architecture versions down to the base versions we have
already support for.

gcc:
	PR target/88799
	* config/arm/arm-cpus.in (mp): New feature.
	(sec): New feature.
	(fgroup ARMv7ve): Add mp and sec features.
	(arch armv7-a): Add options to allow mp and sec extensions.
	(cpu generic-armv7-a): Add options to allow mp and sec extensions.
	(cpu cortex-a5, cpu cortex-7, cpu cortex-a9): Add mp and sec
	extenstions to the base architecture.
	(cpu cortex-a8): Add sec extension to the base architecture.
	(cpu marvell-pj4): Add mp and sec extensions to the base architecture.
	* config/arm/t-aprofile (MULTILIB_MATCHES): Map all armv7-a arch
	variants down to the base v7-a varaint.
	* config/arm/t-multilib (v7_a_arch_variants): New variable.
	* doc/invoke.texi (ARM Options): Add +mp and +sec to the list
	of permitted extensions for -march=armv7-a and for
	-mcpu=generic-armv7-a.

testsuite:
	* gcc.target/arm/multilib.exp (config "aprofile"): Add tests for
	mp and sec extensions to armv7-a.

From-SVN: r268072