This avoids embedding {RelocInfo::CODE_TARGET} addresses into WasmCode
by calling a WebAssembly runtime stub instead. The stubs themselves are
not yet independent of the Isolate, but will be made so soon.

Note that this also introduces a proper {compiler::TrapId} to avoid
accidental parameter type confusion with {TrapIf} and {TrapUnless}
operators.

R=clemensh@chromium.org
BUG=v8:7424

Change-Id: I32ef5a1253f336fc739d2192247826e9458456df
Reviewed-on: https://chromium-review.googlesource.com/1086937Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53557}