[PATCH] Allow overriding -split-dwarf-file

[Lubos Lunak]

 The option -split-dwarf-file is passed by the driver to the compiler after 
processing -Xclang options, thus overriding any possible explicitly specified 
option:

$ clang++ -c -gsplit-dwarf a.cpp -o a.o -Xclang -split-dwarf-file -Xclang 
b.dwo
$ readelf -wi a.o | grep dwo_name
    <c>   DW_AT_GNU_dwo_name: (indirect string, offset: 0x0): a.dwo

 This is because the driver invokes the compiler as
/usr/bin/clang-3.4 -cc1 ... -split-dwarf-file b.dwo -o a.o -x c++ 
a.cpp -split-dwarf-file a.dwo

 The attached patch fixes this. Ok to push?

-- 
 Lubos Lunak
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