The WasmCompileLazy runtime function used to return the start of the
instructions of the newly compiled function. With garbage collection of
wasm code, it would be tricky to keep this wasm code object alive until
it is being called. Thus make the runtime function not return anything,
and call via the jump table instead. The jump table was patched as part
of lazy compilation to point to the compiled code.

Drive-by: Merge {LazyCompileFunction} into single caller {CompileLazy}.

R=mstarzinger@chromium.org

Bug: v8:8217
Change-Id: Id3c02f4dfe2c536e335af2e7e1b9700203d48675
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1509472
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60163}