deps: cherry-pick 09de996 from V8 upstream

Original commit message:
  [debugger] fix switch block source positions.

  The switch statement itself is part of the switch block.
  However, the source position of the statement is outside of
  the block. This leads to confusion for the debugger, if the
  switch block pushes a block context: the current context is
  a block context, but the scope analysis based on the current
  source position tells the debugger that we should be outside
  the scope, so we should have the function context.

  R=marja@chromium.org
  BUG=v8:6085
  Review-Url: https://codereview.chromium.org/2744213003
  Cr-Commit-Position: refs/heads/master@{#43744}
  Committed: https://chromium.googlesource.com/v8/v8/+/09de9969ccb9bc3bbd667788afad665b309d02f5

Fixes: https://github.com/nodejs/node/issues/11746
PR-URL: https://github.com/nodejs/node/pull/11905
Fixes: https://github.com/nodejs/node/issues/11746
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/deps/v8/src/parsing/parser.cc b/deps/v8/src/parsing/parser.cc
index 8d8890129f..3ed7af267e 100644
--- a/deps/v8/src/parsing/parser.cc
+++ b/deps/v8/src/parsing/parser.cc
@@ -1729,6 +1729,10 @@ Statement* Parser::RewriteSwitchStatement(Expression* tag,
   Block* cases_block = factory()->NewBlock(NULL, 1, false, kNoSourcePosition);
   cases_block->statements()->Add(switch_statement, zone());
   cases_block->set_scope(scope);
+  DCHECK_IMPLIES(scope != nullptr,
+                 switch_statement->position() >= scope->start_position());
+  DCHECK_IMPLIES(scope != nullptr,
+                 switch_statement->position() < scope->end_position());
   switch_block->statements()->Add(cases_block, zone());
   return switch_block;
 }