[cfe-commits] [PATCH]: GPROF implementation

[Roman Divacky]

Hi,

The attached patch implemented GPROF (ie. -pg) support in clang.

It introduces GPROFInstrument CodeGenOption and sets it when -pg
is specified. The FreeBSD ::Link() method was adjusted to link
the correct libraries when -pg is specified. Finally, CodeGen
was modified to emit calls to "mcount" (the actual name differs
between arch/OS tuples) at the start of the function body.

This patch is quite FreeBSD specific (the driver modification
and the mcount name selection) but adding other OSes should be
trivial once this is commited.

Please review!

roman
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