[PATCH] Add option to filter finstrument-functions by size

[Robert Grosse]

When instrumenting functions, it is often desirable to avoid instrumenting
small functions for performance reasons. This patch adds an option,
-finstrument-functions-size=n which lets you selectively apply function
instrumentation to functions with at least n basic blocks.

It also fixes the tests associated with -finstrument-functions. Previously,
the CHECK-NOT assertions passed even when the function in question actually
was instrumented due to overly lax string matching.
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