Merging r265134:

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r265134 | slthakur | 2016-04-01 17:25:33 +0530 (Fri, 01 Apr 2016) | 9 lines

[MIPS][LLVM-MC] Fix JR encoding for MIPSR6 ISA

Summary: The assembler was picking the wrong JR variant because the pre-R6 one was still enabled at R6.

Author: nitesh.jain
Reviewers: vkalintiris, dsanders
Subscribers: dsanders, llvm-commits, mohit.bhakkad, sagar, bhushan, jaydeep
Differential: D18387

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llvm-svn: 270675