This introduces a new `GetLocation()` method for `v8::StackFrame`s,
which returns both line and column number at the same time (using the
existing `v8::Location` class). Since `v8::StackFrame` instances store
only the source position (per https://bit.ly/v8-stack-frame), we
currently need to look up the source position in the Script's line table
twice, once when we request the line number, and another time when we
request the column number.

With `GetLocation()` we perform only a single lookup in the Script's
line table and return both line and column number at the same time. This
cuts roughly 8% of the average execution time from the `standalone.js`
benchmark mentioned in crbug.com/1280519.

Bug: chromium:1280519, chromium:1278650, chromium:1069425
Bug: chromium:1077657, chromium:1283162
Doc: https://bit.ly/v8-cheaper-inspector-stack-traces
Change-Id: Ia3a0502990b6230363112a358b59875283399404
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3359628Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78452}