[arm] Remove insn_flags.

[arm] Remove insn_flags.

This patch finishes the job of removing insn_flags and moves the logic
over to using the new data structures.  I've added a new boolean
variable to detect when we have ARMv7ve-like capabilities and thus
have 64-bit atomic operations since that would be a complex query and
expensive to do in full.  It might be better to add a specific bit to
the ISA data structures to indicate this capability directly.

	* arm-protos.h (insn_flags): Delete declaration.
	(arm_arch7ve): Declare.
	* arm.c (insn_flags): Delete.
	(arm_arch7ve): New variable.
	(arm_selected_cpu): Delete.
	(arm_option_check_internal): Use new ISA bitmap.
	(arm_option_override_internal): Likewise.
	(arm_configure_build_target): Declare arm_selected_cpu locally.
	(arm_option_override): Use new ISA bitmap.  Initialize arm_arch7ve.
	Rearrange variable intialization by general function.
	* arm.h (TARGET_HAVE_LPAE): Use arm_arch7ve.

From-SVN: r243703