[liveedit] Enable Myers algorithm

This CL enables Myers algorithm introduced with
https://crrev.com/c/3804860.

Note that Myers finds slightly different diffs in some cases compared
to the current approach so this CL has to rebaseline one test.

R=kimanh@chromium.org

Bug: chromium:1205288
Change-Id: Ife4708a9edf543db938024a5e14c34a589d6a22a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3810244Reviewed-by: Kim-Anh Tran <kimanh@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82247}

src/debug/liveedit-diff.h

@@ -40,9 +40,8 @@ class Comparator {
   };
 
   // Finds the difference between 2 arrays of elements.
-  static void CalculateDifference(
-      Input* input, Output* result_writer,
-      CompareMethod = CompareMethod::kDynamicProgramming);
+  static void CalculateDifference(Input* input, Output* result_writer,
+                                  CompareMethod = CompareMethod::kMyers);
 };
 
 }  // namespace internal

test/cctest/test-liveedit.cc

@@ -188,11 +188,11 @@ TEST(LiveEditTranslatePosition) {
   CompareStringsOneWay("aabbaaaa", "aaaabbaa", &changes);
   CHECK_EQ(LiveEdit::TranslatePosition(changes, 0), 0);
   CHECK_EQ(LiveEdit::TranslatePosition(changes, 1), 1);
-  CHECK_EQ(LiveEdit::TranslatePosition(changes, 2), 4);
-  CHECK_EQ(LiveEdit::TranslatePosition(changes, 3), 5);
-  CHECK_EQ(LiveEdit::TranslatePosition(changes, 4), 6);
-  CHECK_EQ(LiveEdit::TranslatePosition(changes, 5), 7);
-  CHECK_EQ(LiveEdit::TranslatePosition(changes, 6), 8);
+  CHECK_EQ(LiveEdit::TranslatePosition(changes, 2), 2);
+  CHECK_EQ(LiveEdit::TranslatePosition(changes, 3), 3);
+  CHECK_EQ(LiveEdit::TranslatePosition(changes, 4), 2);
+  CHECK_EQ(LiveEdit::TranslatePosition(changes, 5), 3);
+  CHECK_EQ(LiveEdit::TranslatePosition(changes, 6), 6);
   CHECK_EQ(LiveEdit::TranslatePosition(changes, 8), 8);
 }