Backport of the patch for PR target/91816

Backport of the patch for PR target/91816

This is a patch for an issue where the compiler was generating a
conditional branch in Thumb2, which was too far for b{cond} to handle.

This backport also includes the subsequent fixes to the test in this
patch.

gcc/ChangeLog

	PR target/91816
	* config/arm/arm-protos.h: New function arm_gen_far_branch prototype.
	* config/arm/arm.c (arm_gen_far_branch): New function
	arm_gen_far_branch.
	* config/arm/arm.md: Update b<cond> for Thumb2 range checks.

gcc/testsuite/ChangeLog

	PR target/91816
	* gcc.target/arm/pr91816.c: New test.