llvm-mc disassembler chooses default subtarget if -mattr is unspecified

[Xiaochu Liu]

Many of my new colleagues in the research lab have problem with
unrecognized instructions when using llvm-mc to disassemble ARM binaries.
The problem is that they don't even know sub target concept in LLVM MC.
I made some small modifications for the llvm-mc tool (for ARM) so that if
you just specify the triple instead of the mattr you can still cover the
default sub target we offer. I think this will help many beginners who were
scared away when they saw error message disassembling binary with LLVM.
I do see some brilliant guy actively working on embedding the sub target
into table description. I think this will push the MC project to a new
stage!
But before that happens, this seems to be one of the optional temporary
remedy.
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