Update on "[compiler] Support method-call version of macro functions"

Adds fixtures for `macro.namespace(...)` style invocations which we use internally in some cases instead of just `macro(...)`. I tried every example i could think of that could possibly break it (including basing one off of another fixture where we hit an invariant related due to a temporary being emitted for a method call), and they all worked. I just had to fix an existing bug where we early return in some cases instead of continuing, which is a holdover from when this pass was originally written as a ReactiveFunction visitor.

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