[Interpreter] Add two more Ignition skips for mjsunit/compiler on Arm.

BUG=v8:4280
LOG=N
TBR=machenbach@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1568533005

Cr-Commit-Position: refs/heads/master@{#33150}

test/mjsunit/mjsunit.status

@@ -1145,6 +1145,8 @@
   'array-sort': [SKIP],
   'array-store-and-grow': [SKIP],
   'compiler/division-by-constant': [SKIP],
+  'compiler/math-floor-global': [SKIP],
+  'compiler/math-floor-local': [SKIP],
   'compiler/osr-big': [SKIP],
   'compiler/osr-nested': [SKIP],
   'compiler/osr-one': [SKIP],