This reverts commit a05bcc3a.

Reason for revert: Still issues with maybe_assigned, blocking roll.

Original change's description:
> Reland "Enable lazy source positions by default"
> 
> Second attempt to reland 69fafb5f
> now that the maybe_assigned bug is fixed.
> 
> > Original change's description:
> > Enable lazy source positions by default
> >
> > Also adds a compile time flag which allows the default to be configured
> > so node can disable it since it hangs the node cpu profiler tests.
> >
> > Bug: v8:8510
> > Change-Id: Idf4785036dc6242769410091518a67ac9179b718
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1491491
> > Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
> > Commit-Queue: Dan Elphick <delphick@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#62089}
> 
> Bug: v8:8510
> Change-Id: Ia6d5d1d3a3c2b6a14c70ee67b02bec62a6a1a1d4
> Cq-Include-Trybots: luci.v8.try:v8_linux_gc_stress_dbg, v8_linux64_gc_stress_custom_snapshot_dbg_ng
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1679498
> Commit-Queue: Dan Elphick <delphick@chromium.org>
> Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#62411}

TBR=rmcilroy@chromium.org,delphick@chromium.org

Change-Id: I52b2924e05ff87f6469be4723e5e13979d1aeffa
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:8510
Cq-Include-Trybots: luci.v8.try:v8_linux_gc_stress_dbg, v8_linux64_gc_stress_custom_snapshot_dbg_ng
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1680553Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62428}