gas: sframe: handle .cfi_same_value

gas: sframe: handle .cfi_same_value

Fix PR gas/32953 - sframe: incorrect handling of .cfi_same_value in gas

As per documentation, .cfi_same_value indicates that the current value
of register is the same like in the previous frame, i.e. no restoration
needed.

gas/
	* gen-sframe.c (sframe_xlate_do_same_value): New definition.
	(sframe_do_cfi_insn): Handle DW_CFA_same_value.
gas/testsuite/
	* gas/cfi-sframe/cfi-sframe.exp: Add new tests.
	* gas/cfi-sframe/cfi-sframe-common-11.d: New test.
	* gas/cfi-sframe/cfi-sframe-common-11.s: New test.