The placement of the exceptipon section is by now restricted to be in
between the Global and the Import section. This changes our validation
to check this stricter requirement now.

R=clemensh@chromium.org
TEST=unittests/WasmModuleVerifyTest
BUG=v8:8091

Change-Id: Ib3ea625fd4df93bffda47ced09e6969159f7ac70
Reviewed-on: https://chromium-review.googlesource.com/c/1356504Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57962}