This removes a special case for eager initialization of function tables
used by asm.js modules. For such modules the table in question can never
be exported. It is used to implement asm.js function tables (for details
see section 6.3 - ValidateFunctionTable in the asm.js spec). Since such
tables are never exported, it should be beneficial to lazily allocate
the export entries.

R=ahaas@chromium.org

Change-Id: I5099d548fe1d2432584d1a09b756c136866d4a0b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1539578Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60528}