[compiler] Re-enable lazy source positions

5th attempt to reland now that crash with cpu profiler combined with
code caching is fixed.

Bug: v8:8510
Change-Id: I3489150a5067c41c36a4b468e412f9398a55135d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1762293Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63290}

BUILD.gn

@@ -188,8 +188,8 @@ declare_args() {
   # Sets -DV8_SHARED_RO_HEAP.
   v8_enable_shared_ro_heap = ""
 
-  # Disable lazy source positions by default.
-  v8_enable_lazy_source_positions = false
+  # Enable lazy source positions by default.
+  v8_enable_lazy_source_positions = true
 
   # Disable write barriers when GCs are non-incremental and
   # heap has single generation.