[PATCH] [cfe] Added -finstrument-functions-exclude-{file, function}-list

[Matthew Iselin]

Hi all,

This patch adds two options, -finstrument-functions-exclude-file-list=
and -finstrument-functions-exclude-function=, which offer a means
through which headers in various locations and individual functions
can be excluded from instrumentation via -finstrument-functions. These
options can be found in GCC alongside -finstrument-functions.

Excluded functions do not have __cyg_profile_* calls emitted in them.

The options in this patch differ from the GCC options in the following ways:
* functions are checked and specified based on internal mangled names
* entires in the function list are not checked as substrings of
functions (that is, "hello" only matches "hello", not "helloworld").

I have included a few tests to ensure the behaviour is as expected,
and with these GCC-incompatible caveats.

Cheers,

- Matthew
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