[dev.ssa] cmd/compile/internal/ssa: Handle variables correctly

[dev.ssa] cmd/compile/internal/ssa: Handle variables correctly

Use *Node of type ONAME instead of string as the key for variable maps.
This will prevent aliasing between two identically named but
differently scoped variables.

Introduce an Aux value that encodes the offset of a variable
from a base pointer (either global base pointer or stack pointer).

Allow LEAQ and derivatives (MOVQ, etc.) to also have such an Aux field.

Allocate space for AUTO variables in stackalloc.

Change-Id: Ibdccdaea4bbc63a1f4882959ac374f2b467e3acd
Reviewed-on: https://go-review.googlesource.com/11238
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>