[PATCH] [LNT] Tolerate "clang -v" output without leading spaces

[Jingyue Wu]

The output of "clang -v -E -x c /dev/null -###" on the trunk doesn't have
the leading spaces as previous versions.

"/home/jingyue/Work/llvm/install-git/bin/clang" "-cc1" "-triple"
"x86_64-unknown-linux-gnu" "-E" ...

This patch makes the leading space optional; otherwise, compiler.py will
not be able to find the cc1 binary.

Jingyue
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