Merging r270542:

------------------------------------------------------------------------
r270542 | slthakur | 2016-05-24 15:27:10 +0530 (Tue, 24 May 2016) | 9 lines

[MIPS][LLVM-MC] Fix Disassemble of Negative Offset

Patch by Nitesh Jain.

Summary: The type of Imm in MipsDisassembler.cpp was incorrect since SignExtend64 return int64_t type.As per the MIPSr6 doc ,the offset is added to the address of the instruction following the branch (not the branch itself), to form a PC-relative effective target address hence “4” is added to the offset. The offset of some test case are update to reflect the changes due to “ + 4 ” offset and new test case for negative offset are added.

Reviewers: dsanders, vkalintiris
Differential Revision: http://reviews.llvm.org/D17540

------------------------------------------------------------------------

llvm-svn: 270676