arm testsuite: Shifts and get_FPSCR ACLE optimisation fixes

arm testsuite: Shifts and get_FPSCR ACLE optimisation fixes

These newly updated tests were rewritten by Andrea. Some of them
needed further manual fixing as follows:

* The #shift immediate value not in the check-function-bodies as expected
* The ACLE was specifying sub-optimal code: lsr+and instead of ubfx. In
  this case the test rewritten from the ACLE had the lsr+and pattern,
  but the compiler was able to optimise to ubfx. Hence I've changed the
  test to now match on ubfx.
* Added a separate test to check shift on constants being optimised to
  movs.

gcc/testsuite/ChangeLog:

	* gcc.target/arm/mve/intrinsics/srshr.c: Update shift value.
	* gcc.target/arm/mve/intrinsics/srshrl.c: Update shift value.
	* gcc.target/arm/mve/intrinsics/uqshl.c: Update shift value.
	* gcc.target/arm/mve/intrinsics/uqshll.c: Update shift value.
	* gcc.target/arm/mve/intrinsics/urshr.c: Update shift value.
	* gcc.target/arm/mve/intrinsics/urshrl.c: Update shift value.
	* gcc.target/arm/mve/intrinsics/vadciq_m_s32.c: Update to ubfx.
	* gcc.target/arm/mve/intrinsics/vadciq_m_u32.c: Update to ubfx.
	* gcc.target/arm/mve/intrinsics/vadciq_s32.c: Update to ubfx.
	* gcc.target/arm/mve/intrinsics/vadciq_u32.c: Update to ubfx.
	* gcc.target/arm/mve/intrinsics/vadcq_m_s32.c: Update to ubfx.
	* gcc.target/arm/mve/intrinsics/vadcq_m_u32.c: Update to ubfx.
	* gcc.target/arm/mve/intrinsics/vadcq_s32.c: Update to ubfx.
	* gcc.target/arm/mve/intrinsics/vadcq_u32.c: Update to ubfx.
	* gcc.target/arm/mve/intrinsics/vsbciq_m_s32.c: Update to ubfx.
	* gcc.target/arm/mve/intrinsics/vsbciq_m_u32.c: Update to ubfx.
	* gcc.target/arm/mve/intrinsics/vsbciq_s32.c: Update to ubfx.
	* gcc.target/arm/mve/intrinsics/vsbciq_u32.c: Update to ubfx.
	* gcc.target/arm/mve/intrinsics/vsbcq_m_s32.c: Update to ubfx.
	* gcc.target/arm/mve/intrinsics/vsbcq_m_u32.c: Update to ubfx.
	* gcc.target/arm/mve/intrinsics/vsbcq_s32.c: Update to ubfx.
	* gcc.target/arm/mve/intrinsics/vsbcq_u32.c: Update to ubfx.
	* gcc.target/arm/mve/mve_const_shifts.c: New test.