This CL implements two additional evaluator module proxy operations for
accessing globals and values on the wasm operand stack.

Drive-By: Also fix how the breakpoint position is computed in the evalutor
tests.

Bug: chromium:1020120
Change-Id: I161768da9e12586b2c710f5b26922b9600527814
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2282526
Commit-Queue: Philip Pfaffe <pfaffe@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68704}