[dev.ssa] cmd/compile: start arguments as spilled
Declare a function's arguments as having already been spilled so their use just requires a restore. Allow spill locations to be portions of larger objects the stack. Required to load portions of compound input arguments. Rename the memory input to InputMem. Use Arg for the pre-spilled argument values. Change-Id: I8fe2a03ffbba1022d98bfae2052b376b96d32dda Reviewed-on: https://go-review.googlesource.com/16536 Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:David Chase <drchase@google.com>
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