Expression matching API (#3134)

Provides an easily extensible layered API for matching expression patterns and
extracting their components. The low-level API provides modular building blocks
for creating matchers for any data type and the high-level API provides a
succinct and flexible interface for matching expressions and extracting useful
information from them.

Matchers are currently provided for Const, Unary, Binary, and Select
instructions. Adding a matcher for a new type of expression is straightforward
enough that I expect to add them as they become useful as part of other changes.

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