The rules for handling foreign functions were interfering with handling
of standard functions (such as fround).

Adding more tests around abs()

BUG= https://bugs.chromium.org/p/v8/issues/detail?id=4203
TEST=test-asm-validator,asm-wasm
R=titzer@chromium.org,rossberg@chromium.org
LOG=N

Review URL: https://codereview.chromium.org/1794303002

Cr-Commit-Position: refs/heads/master@{#34756}