[foozzie] Override more mjsunit.js methods for better output comparison

TBR=yangguo@chromium.org
NOTRY=true

Bug: chromium:813833
Change-Id: I8f687d27981a54234c37ba2e4b22060696f6dee7
Reviewed-on: https://chromium-review.googlesource.com/936006Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51538}

tools/clusterfuzz/v8_foozzie_harness_adjust.js

@@ -57,5 +57,29 @@ try {
     this.fail = function fail(expectedText, found, name_opt) {
       print(prettyPrinted(found));
     }
+
+    this.assertSame = function assertSame(expected, found, name_opt) {
+      print(prettyPrinted(found));
+    }
+
+    this.assertNotSame = function assertNotSame(expected, found, name_opt) {
+      print(prettyPrinted(found));
+    }
+
+    this.assertEquals = function assertEquals(expected, found, name_opt) {
+      print(prettyPrinted(found));
+    }
+
+    this.assertNotEquals = function assertNotEquals(expected, found, name_opt) {
+      print(prettyPrinted(found));
+    }
+
+    this.assertNull = function assertNull(value, name_opt) {
+      print(prettyPrinted(value));
+    }
+
+    this.assertNotNull = function assertNotNull(value, name_opt) {
+      print(prettyPrinted(value));
+    }
   })();
 } catch(e) { }