With this CL, the bytecode graph builder no longer translates module
loads/stores as runtime calls but in terms of two new JS operators.  These are
lowered in typed-lowering to a sequence of LoadField's.

R=bmeurer@chromium.org
CC=adamk@chromium.org
BUG=v8:1569

Review-Url: https://codereview.chromium.org/2489863003
Cr-Commit-Position: refs/heads/master@{#40881}