Fixed a couple of failing DCHECK(has_pending_exception()).

test/mjsunit/mjsunit.status

Index: test/mjsunit/mjsunit.status
diff --git a/test/mjsunit/mjsunit.status b/test/mjsunit/mjsunit.status
index 1b831d44d896d7d9ed3649ec9bda47ba7c061896..cef7825eb869928d44fe2eb607aaa8b546a8718a 100644
--- a/test/mjsunit/mjsunit.status
+++ b/test/mjsunit/mjsunit.status
@@ -177,6 +177,9 @@
   # Issue 488: this test sometimes times out.
   'array-constructor': [PASS, TIMEOUT],
 
+  # Run only on fast architectures, contains no architecture dependent code.
+  'regress/regress-crbug-491062': [PASS, ['arch != ia32 and arch != x64', SKIP], NO_VARIANTS],
+
   # Very slow on ARM and MIPS, contains no architecture dependent code.
   'unicode-case-overoptimization': [PASS, NO_VARIANTS, ['arch == arm or arch == android_arm or arch == android_arm64 or arch == mipsel or arch == mips64el or arch == mips', TIMEOUT]],
   'regress/regress-3976': [PASS, NO_VARIANTS, ['arch == arm or arch == android_arm or arch == android_arm64 or arch == mipsel or arch == mips64el or arch == mips', SKIP]],