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[binutils-gdb] MIPS/BFD: Simplify register index calculation in BZ16_REG_FIELD

*** TEST RESULTS FOR COMMIT eb6b0cf45d7588eb147d90ce790254309a69613e ***

Author: Maciej W. Rozycki <macro@imgtec.com>
Branch: master
Commit: eb6b0cf45d7588eb147d90ce790254309a69613e

MIPS/BFD: Simplify register index calculation in BZ16_REG_FIELD

Just mask higher bits off, which returns the same set of 3-bit register
encodings of { 0, 1, 2, 3, 4, 5, 6, 7 } for the allowed 5-bit encodings
of { 16, 17, 2, 3, 4, 5, 6, 7 }.  Input has already been validated with
OP16_VALID_REG.

	bfd/
	* elfxx-mips.c (BZ16_REG_FIELD): Simplify calculation.
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