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- Fix for #13904 -- stop "trashing" callee-saved registers, since it is not actually doing anything useful. - Fix for #14251 -- fixes the calling convention for functions passing raw SSE-register values by adding padding as needed to get the values in the right registers. This problem cropped up when some args were unused an dropped from the live list. - Fixed a typo in 'readnone' attribute - Added 'lower-expect' pass to level 0 LLVM optimization passes to improve block layout in LLVM for stack checks, etc. Test Plan: `make test WAYS=optllvm` and `make test WAYS=llvm` Reviewers: bgamari, simonmar, angerman Reviewed By: angerman Subscribers: rwbarton, carter GHC Trac Issues: #13904, #14251 Differential Revision: https://phabricator.haskell.org/D5190
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