Coprocessor intrinsic tests in gcc.target/arm/acle test whether
__ARM_FEATURE_COPROC has the right bit defined before calling the
intrinsic. This allows to test both the correct setting of that macro
and the availability and correct working of the intrinsic. However the
__ARM_FEATURE_COPROC macro is no longer defined for ARMv8-A since
r249399.

This patch changes the testcases to skip that test for ARMv8-A and
ARMv8-R targets.  It also fixes some irregularity in the coprocessor
effective targets:
- add ldcl and stcl to the list of instructions listed as guarded by
   arm_coproc1_ok
- enable tests guarded by arm_coproc2_ok, arm_coproc3_ok and
   arm_coproc4_ok for Thumb-2 capable targets but disable for Thumb-1
   targets.

ChangeLog entry is as follows:

*** gcc/testsuite/ChangeLog ***

2017-07-04  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* gcc.target/arm/acle/cdp.c: Skip __ARM_FEATURE_COPROC check for
	ARMv8-A and ARMv8-R.
	* gcc.target/arm/acle/cdp2.c: Likewise.
	* gcc.target/arm/acle/ldc.c: Likewise.
	* gcc.target/arm/acle/ldc2.c: Likewise.
	* gcc.target/arm/acle/ldc2l.c: Likewise.
	* gcc.target/arm/acle/ldcl.c: Likewise.
	* gcc.target/arm/acle/mcr.c: Likewise.
	* gcc.target/arm/acle/mcr2.c: Likewise.
	* gcc.target/arm/acle/mcrr.c: Likewise.
	* gcc.target/arm/acle/mcrr2.c: Likewise.
	* gcc.target/arm/acle/mrc.c: Likewise.
	* gcc.target/arm/acle/mrc2.c: Likewise.
	* gcc.target/arm/acle/mrrc.c: Likewise.
	* gcc.target/arm/acle/mrrc2.c: Likewise.
	* gcc.target/arm/acle/stc.c: Likewise.
	* gcc.target/arm/acle/stc2.c: Likewise.
	* gcc.target/arm/acle/stc2l.c: Likewise.
	* gcc.target/arm/acle/stcl.c: Likewise.
	* lib/target-supports.exp:
	(check_effective_target_arm_coproc1_ok_nocache): Mention ldcl
	and stcl in the comment.
	(check_effective_target_arm_coproc2_ok_nocache): Allow Thumb-2 targets
	and disable Thumb-1 targets.
	(check_effective_target_arm_coproc3_ok_nocache): Likewise.
	(check_effective_target_arm_coproc4_ok_nocache): Likewise.

Tested by running all tests in gcc.target/arm/acle before and after this
patch for ARMv6-M, ARMv7-M, ARMv7E-M, ARMv3, ARMv4 (ARM state), ARMv4T
(Thumb state), ARMv5 (ARM state), ARMv5TE (ARM state), ARMv6 (ARM
state), ARMv6T2 (Thumb state) and and ARMv8-A (both state). The only
changes are for ARMv8-A where tests FAILing are now PASSing again.

Is this ok for trunk?

Best regards,

Thomas