Keep correct `fieldSeq` for 0-offset fields.#32085

Merged

sandreenko merged 5 commits intodotnet:masterfrom sandreenko:prepareForMike'sChanges

Feb 15, 2020

+137-88

Commits on Feb 13, 2020

a few renamings in fgMorphCopyBlock.
Sergey Andreenko
committed
Add zero field offsets where it was missed.
Sergey Andreenko
committed
Add an optimization to lower to delete LEA(addr, 0).
Sergey Andreenko
committed

Commits on Feb 14, 2020

Fix for x86 tests.
Sergey Andreenko
committed
Add a function header for LowerNode.
Sergey Andreenko
committed