[LLDB][MIPS] Clear bug 25194 - LLDB-Server Assertion raised when single stepping on MIPS

This patch will clear bug 25194 - LLDB-Server Assertion raised when single stepping on MIPS. The problem was that while emulating instructions, old and new pc values would have garbage value in their upper 32 bits. Therefore checking if pc was changed (old_pc == new_pc) would always return false, because of which pc was not getting updated.

/* If we haven't changed the PC, change it here */
if (old_pc == new_pc)
{
    new_pc += 4;
    Context context;
        return false;
}

Reviewers: tberghammer, clayborg
Subscribers: dsanders, lldb-commits, mohit.bhakkad, bhushan, jaydeep, nitesh.jain
Differential: http://reviews.llvm.org/D14633
llvm-svn: 254379