PATCH: R600/SI: Change all instruction names to lowercase

[Tom Stellard]

Hi,

This branch: http://cgit.freedesktop.org/~tstellar/llvm/log/?h=si-lowercase
contains patches for converting all of the assembly strings for SI instructions
to lower case.

The rationale behind this change is to make the assembly output of the R600
backend match the AMD proprietary compiler, so it is easier to compare code.
This will also allow us to implement an assembler which uses a syntax more
people are familiar with.

I've pasted some shell scripts into the commit message that you can use for
converting old branches to the new naming scheme in order to make merging
patches easier.  If you run into major merge problems from this change,
let me know and I can help.

-Tom