This makes sure the reverse tag translation of direct call targets to
respective call tags is properly performed. Otherwise all direct call
end up being deserialized to call the function with index '0'. Ooops!

R=clemensh@chromium.org
TEST=mjsunit/wasm/compiled-module-serialization
BUG=chromium:857049

Change-Id: I37c1ee72b000daec87efdeed08d60a067b1a1b0c
Reviewed-on: https://chromium-review.googlesource.com/1120256Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54124}