Revert CorePrep part of "Completely new treatment of INLINE pragmas..."
The original patch said: * I made some changes to the way in which eta expansion happens in CorePrep, mainly to ensure that *arguments* that become let-bound are also eta-expanded. I'm still not too happy with the clarity and robustness fo the result. Unfortunately this change apparently broke some invariants that were relied on elsewhere, and in particular lead to panics when compiling with profiling on. Will re-investigate in the new year.
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