Handler tables (and other inlined Code metadata) will have to move
outside the .text section. This CL creates Code::HandlerTableAddress()
as a single chokepoint for accessing the handler table of a Code
object.

Drive-by: Create a dedicated constructor for WasmCode handler tables.

Bug: v8:7777
Change-Id: I01c5157b732ba509b2c76f2744fde271c2ba1411
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2295605
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Auto-Submit: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68835}