Add comments to LLDB-MI disassembly.

Summary:
This patch adds the comments which are included in LLDB disassembly, but are currently missing in MI, e.g.

 ^done,asm_insns=[...,{address="0x00000000004004ff",func-name="main",offset="18",size="2",inst="jmp 0x40050b ; <+30> at main.c:7"}]

 instead of

 ^done,asm_insns=[...,{address="0x00000000004004ff",func-name="main",offset="18",size="2",inst="jmp 0x40050b"}]

Thanks, Ewan

Patch from ewan@codeplay.com

Reviewers: abidh, EwanCrawford

Subscribers: ted, lldb-commits, deepak2427

Differential Revision: http://reviews.llvm.org/D8964

llvm-svn: 235017