[ubsan] Fix various ClusterFuzz-found issues
Fixing a few float and int overflows. Drive-by fix: with --experimental-wasm-bigint, Number values may not be used to initialize i64-typed globals. The existing code for doing that relied on UB; since it's a spec violation the fix is to throw instead. No regression test for 933103 because it will OOM anyway. No regression test for 932896 because it would be extremely slow. Bug: chromium:927894, chromium:927996, chromium:930086, chromium:932679, chromium:932896, chromium:933103, chromium:933134 Change-Id: Iae1c1ff1038af4512a52d3e56b8c4b75f2233314 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1495911 Commit-Queue: Jakob Kummerow <jkummerow@chromium.org> Reviewed-by:Michael Starzinger <mstarzinger@chromium.org> Reviewed-by:
Adam Klein <adamk@chromium.org> Cr-Commit-Position: refs/heads/master@{#60075}
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