Update cranelift#321

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sunfishcode wants to merge 4 commits intobytecodealliance:masterfrom

sunfishcode:update-cranelift

Commits on Sep 4, 2019

Add stubs for constant relocation in RelocSink

abrown
authored and
sunfishcode
committed
Refactor usage of SecondaryMap impls (serde, PartialEq)

mrowqa
authored and
sunfishcode
committed
Refactor: cascade of matches in cache system

mrowqa
authored and
sunfishcode
committed
Trace log access to cache system

mrowqa
authored and
sunfishcode
committed