[PATCH][ARM][GCC] Add a self test for FPU feature bits

[Tamar Christina]

Hi All,

This patch adds a more elaborate self-test to the arm back-end
which tests to make sure you don't have any bit specified in
ISA_ALL_FPU_INTERNAL that are not defined by any fpu configuration.

Catching this during the self-test prevents an ICE at runtime when
-mfpu=auto tries to detect the fpu to use.

Regtested on arm-none-eabi and no issues.

Ok for trunk?

gcc/
2017-10-05  Tamar Christina  <tamar.christina@arm.com>

	* config/arm/arm.c (arm_test_fpu_data): New.
	(arm_run_selftests): Call arm_test_fpu_data.

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