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Restores a separate representation of the V8 embedded code range as
compared to runtime-generated code ranges, now that V8 provides access
to this state in the API. This distinction was made in an earlier
version of the V8 unwind API but the current version did not previously
expose the necessary information. Representing the embedded code range
allows profiling of JavaScript builtins which live within the range.

Along the way fixes a bug in StackSamplerImpl where the unwinder's
AddInitialModules was invoked twice if the unwinder was added before
profiling started.

Fixed: 1136256
Change-Id: I6ec1433fcf5b7704cb9022781edc423d027b8da9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2476626
Commit-Queue: Mike Wittman <wittman@chromium.org>
Auto-Submit: Mike Wittman <wittman@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Etienne Pierre-Doray <etiennep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820934}