[cleanup] Don't bake mjsunit.js line numbers into message tests.

Whenever mjsunit.js changes, these tests might suddenly fail.

R=herhut@chromium.org

Bug: v8:7570
Change-Id: Ib43b03a3df92a4c5acabc193c63f46b29ea992b0
Reviewed-on: https://chromium-review.googlesource.com/1032440Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52839}

test/message/wasm-function-name-async.out

 RuntimeError: unreachable
     at main (wasm-function[0]:1)
     at pair (*%(basename)s:16:27)
-    at promise.then.result (test/mjsunit/mjsunit.js:576:15)
+    at promise.then.result (test/mjsunit/mjsunit.js:*)

test/message/wasm-function-name-streaming.out

 RuntimeError: unreachable
     at main (wasm-function[0]:1)
     at pair (test/message/wasm-function-name-async.js:16:27)
-    at promise.then.result (test/mjsunit/mjsunit.js:576:15)
+    at promise.then.result (test/mjsunit/mjsunit.js:*)

test/message/wasm-module-and-function-name-async.out

 RuntimeError: unreachable
     at test-module.main (wasm-function[0]:1)
     at pair (*%(basename)s:17:27)
-    at promise.then.result (test/mjsunit/mjsunit.js:576:15)
+    at promise.then.result (test/mjsunit/mjsunit.js:*)

test/message/wasm-module-and-function-name-streaming.out

 RuntimeError: unreachable
     at test-module.main (wasm-function[0]:1)
     at pair (test/message/wasm-module-and-function-name-async.js:17:27)
-    at promise.then.result (test/mjsunit/mjsunit.js:576:15)
+    at promise.then.result (test/mjsunit/mjsunit.js:*)

test/message/wasm-module-name-async.out

 RuntimeError: unreachable
     at test-module (wasm-function[0]:1)
     at pair (*%(basename)s:19:27)
-    at promise.then.result (test/mjsunit/mjsunit.js:576:15)
+    at promise.then.result (test/mjsunit/mjsunit.js:*)

test/message/wasm-module-name-streaming.out

 RuntimeError: unreachable
     at test-module (wasm-function[0]:1)
     at pair (test/message/wasm-module-name-async.js:19:27)
-    at promise.then.result (test/mjsunit/mjsunit.js:576:15)
+    at promise.then.result (test/mjsunit/mjsunit.js:*)

test/message/wasm-no-name-async.out

 RuntimeError: unreachable
     at wasm-function[0]:1
     at pair (*%(basename)s:18:27)
-    at promise.then.result (test/mjsunit/mjsunit.js:576:15)
+    at promise.then.result (test/mjsunit/mjsunit.js:*)

test/message/wasm-no-name-streaming.out

 RuntimeError: unreachable
     at wasm-function[0]:1
     at pair (test/message/wasm-no-name-async.js:18:27)
-    at promise.then.result (test/mjsunit/mjsunit.js:576:15)
+    at promise.then.result (test/mjsunit/mjsunit.js:*)