SSR: Allow function calls to match method calls

This differs from how this used to work before I removed it in that:
a) It's only one direction. Function calls in the pattern can match
method calls in the code, but not the other way around.
b) We now check that the function call in the pattern resolves to the
same function as the method call in the code.

The lack of (b) was the reason I felt the need to remove the feature
before.

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