How to inline early in a GHC plugin?

[Conal Elliott]

I'm implementing a GHC plugin that installs a `BuiltInRule` that does the
work, and I'd like to learn how to inline more flexibly. Given an
identifier `v`, I'm using `maybeUnfoldingTemplate (realIdUnfolding v)` to
get a `Maybe CoreExpr`. Sometimes this recipe yields `Nothing` until a
later compiler phase. Meanwhile, I guess my variable `v` has been replaced
by one with inlining info. First, am I understanding this mechanism
correctly? A GHC source pointer to how inlining is made available would
help me. Second, can I access the inlining info before it's made available
to the rest of the simplifier?

Thanks,  - Conal
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