[PATCH] Driver: support detecting driver mode when clang has a version suffix without dash (PR21094)

[Hans Wennborg]

Hi dblaikie, majnemer,

Clang would previously not get into C++ mode when invoked as 'clang++3.6' (though clang++-3.6 would work).

I found the previous loop logic in this function confusing; hopefully this makes it clearer.

http://reviews.llvm.org/D5833

Files:
  test/Driver/parse-progname.c
  tools/driver/driver.cpp
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