[arm] Use ISA feature sets for determining inlinability

[arm] Use ISA feature sets for determining inlinability

Now that we can construct the build target isa from the cl_target_options
data we can use this to determine inlinability.  This eliminates the
final remaining use of the FPU features field.

	* arm.c (arm_can_inline_p): Use ISA features for determining
	inlinability.

From-SVN: r243714