Add missing changes from ARCH removal.

I somehow didn't upload these fixes from the review. So doing that
now.

Test: Unit tests pass.
Change-Id: Ia17e480eb972db4f7be6947c0e6567632c65431f

scripts/stack_core.py

@@ -584,10 +584,6 @@ class RegisterPatternTests(unittest.TestCase):
     lines = example_crash.split('\n')
     symbol.SetBitness(lines)
     tc.UpdateBitnessRegexes()
-    if symbol.ARCH_IS_32BIT:
-      print("32 Bit Arch")
-    else:
-      print("64 Bit Arch")
     for line in lines:
       tc.ProcessLine(line)
       is_register = (re.search(stupid_pattern, line) is not None)