Merging r261206:

------------------------------------------------------------------------
r261206 | bhushan.attarde | 2016-02-18 17:23:28 +0530 (Thu, 18 Feb 2016) | 9 lines

[LLDB][MIPS] Provide CPU string to compiler for appropriate code generation for MIPS
    
    SUMMARY:
    This patch implements ArchSpec::GetClangTargetCPU() that provides string representing current architecture as a target CPU.
    This string is then passed to tools like clang so that they generate correct code for that target.
    
    Reviewers: clayborg, zturner
    Subscribers: mohit.bhakkad, sagar, jaydeep, lldb-commits
    Differential Revision: http://reviews.llvm.org/D17022
------------------------------------------------------------------------

llvm-svn: 271378