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[binutils-gdb] MIPS16/opcodes: Free up `M' operand code

*** TEST RESULTS FOR COMMIT 75f31665204bf965cc5b3dd699636be12fb6bcfa ***

Author: Maciej W. Rozycki <macro@mips.com>
Branch: master
Commit: 75f31665204bf965cc5b3dd699636be12fb6bcfa

MIPS16/opcodes: Free up `M' operand code

The `M' and `m' MIPS16 operand codes are functionally the same, denoting
a 7-bit register list that is encoded the same way for both SAVE and
RESTORE.  Use `m' for both instructions then, making `M' available for a
different use.

	opcodes/
	* mips16-opc.c (decode_mips16_operand) <'M'>: Remove case.
	(mips16_opcodes): Replace `M' with `m' for "restore".

	include/
	* opcode/mips.h: Remove `M' operand code.
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