Add paths to *DynamicScope that don't check nulls, offsets. #4168
+178
−301
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Our IR performes liveness checks on variables and should never
emit code that accesses variable indices outside the prescribed
scope size. This patch adds new getters that do not perform these
unnecessary checks, and wires up the JIT to call them.
This patch does not modify Full interpretation to use these
unchecked paths, because it would require either a boolean in
LocalVariaable operand and LoadLocalVariable instruction or a
pass to replace them with "Unchecked" versions.
It would also be better if we could generate these shapes of
DynamicScope on the fly, rather than maintaining a finite set of
mostly-identical subclasses.
See #4167.