Revert "Reland "Enable lazy source positions by default""

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}

BUILD.gn

@@ -187,9 +187,6 @@ declare_args() {
   # Enable sharing read-only space across isolates.
   # Sets -DV8_SHARED_RO_HEAP.
   v8_enable_shared_ro_heap = ""
-
-  # Enables lazy source positions by default.
-  v8_enable_lazy_source_positions = true
 }
 
 # We reuse the snapshot toolchain for building torque and other generators to
@@ -433,9 +430,6 @@ config("features") {
   if (v8_enable_concurrent_marking) {
     defines += [ "V8_CONCURRENT_MARKING" ]
   }
-  if (v8_enable_lazy_source_positions) {
-    defines += [ "V8_ENABLE_LAZY_SOURCE_POSITIONS" ]
-  }
   if (v8_check_microtasks_scopes_consistency) {
     defines += [ "V8_CHECK_MICROTASKS_SCOPES_CONSISTENCY" ]
   }

src/flags/flag-definitions.h

@@ -298,18 +298,13 @@ DEFINE_BOOL(icu_timezone_data, true, "get information about timezones from ICU")
 #define V8_LITE_BOOL false
 #endif
 
-#ifdef V8_ENABLE_LAZY_SOURCE_POSITIONS
-#define V8_LAZY_SOURCE_POSITIONS_BOOL true
-#else
-#define V8_LAZY_SOURCE_POSITIONS_BOOL false
-#endif
-
 DEFINE_BOOL(lite_mode, V8_LITE_BOOL,
             "enables trade-off of performance for memory savings")
 
 // Lite mode implies other flags to trade-off performance for memory.
 DEFINE_IMPLICATION(lite_mode, jitless)
 DEFINE_IMPLICATION(lite_mode, lazy_feedback_allocation)
+DEFINE_IMPLICATION(lite_mode, enable_lazy_source_positions)
 DEFINE_IMPLICATION(lite_mode, optimize_for_size)
 
 #ifdef V8_ENABLE_FUTURE
@@ -409,7 +404,7 @@ DEFINE_BOOL(ignition_share_named_property_feedback, true,
             "the same object")
 DEFINE_BOOL(print_bytecode, false,
             "print bytecode generated by ignition interpreter")
-DEFINE_BOOL(enable_lazy_source_positions, V8_LAZY_SOURCE_POSITIONS_BOOL,
+DEFINE_BOOL(enable_lazy_source_positions, false,
             "skip generating source positions during initial compile but "
             "regenerate when actually required")
 DEFINE_BOOL(stress_lazy_source_positions, false,