Revert of [debugger] correctly find source position of implicit return statement.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 3dedb122c75e8c391bdff8eaf24c1a96cdf18ef6..67ccd31014249127b5aede7c3cc6be3cdfc7af5e 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -11352,13 +11352,11 @@
     if (cache->IsLineTerminatorSequence(current, next)) line_ends->Add(i);
   }
 
-  if (include_ending_line) {
-    // Include one character beyond the end of script. The rewriter uses that
-    // position for the implicit return statement.
+  if (src_len > 0 && cache->IsLineTerminatorSequence(src[src_len - 1], 0)) {
+    line_ends->Add(src_len - 1);
+  } else if (include_ending_line) {
+    // Even if the last line misses a line end, it is counted.
     line_ends->Add(src_len);
-  } else if (src_len > 0 &&
-             cache->IsLineTerminatorSequence(src[src_len - 1], 0)) {
-    line_ends->Add(src_len - 1);
   }
 }