[llvm] r183343 - R600: Add a pass that merge Vector Register

[Sean Silva]

I'm getting the following warning:

/Users/sean/pg/llvm/llvm/lib/Target/R600/R600OptimizeVectorRegisters.cpp:183:49:
warning: variable 'Chan' is used uninitialized whenever 'for' loop exits
because its condition is false [-Wsometimes-uninitialized]
    for (unsigned j = 0, je = RemapChan.size(); j < je; j++) {
                                                ^~~~~~
/Users/sean/pg/llvm/llvm/lib/Target/R600/R600OptimizeVectorRegisters.cpp:193:17:
note: uninitialized use occurs here
        .addImm(Chan);
                ^~~~
/Users/sean/pg/llvm/llvm/lib/Target/R600/R600OptimizeVectorRegisters.cpp:183:49:
note: remove the condition if it is always true
    for (unsigned j = 0, je = RemapChan.size(); j < je; j++) {
                                                ^~~~~~
/Users/sean/pg/llvm/llvm/lib/Target/R600/R600OptimizeVectorRegisters.cpp:182:18:
note: initialize the variable 'Chan' to silence this warning
    unsigned Chan;
                 ^
                  = 0
1 warning generated.

-- Sean Silva
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