Add -fauto-profile option to Clang driver

[Diego Novillo]

This adds a new option -fauto-profile=filename to Clang. It tells the
driver to schedule the auto-profile pass and passes on the name of the
profile file to use.

This patch depends on the initial auto profile patch I posted a
couple of weeks ago: http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20130923/188838.html


Diego.
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