Update V8 to r6387 as required by WebKit r76408

Change-Id: Icfc5385b0996bd592f8b1ac8cbb44767ee09f1f6
diff --git a/test/mjsunit/debug-liveedit-newsource.js b/test/mjsunit/debug-liveedit-newsource.js
index 7b8945a..a60e69f 100644
--- a/test/mjsunit/debug-liveedit-newsource.js
+++ b/test/mjsunit/debug-liveedit-newsource.js
@@ -64,6 +64,6 @@
 assertEquals("Capybara", ChooseAnimal());
 // Global variable do not get changed (without restarting script).
 assertEquals(25, something1);
-// Function is oneliner, so currently it is treated as damaged and not patched.
-assertEquals(17, ChooseNumber());
+// We should support changes in oneliners.
+assertEquals(18, ChooseNumber());
 assertEquals("Hello Peter", ChooseAnimal.Factory()("Peter"));