[NFC] Move more logic about unfuzzable tests to a shared location (#7175)

It turns out that #7165 was not enough because we had a second (!?)
list of tests to ignore, and also a condition. Move all that to the shared
location as well, continuing that PR.

Also remove simd.wast from the list, as that issue has been fixed.

Author: kripken

scripts/fuzz_opt.py

@@ -309,8 +309,6 @@ def is_git_repo():
 
 all_tests = shared.get_all_tests()
 
-INITIAL_CONTENTS_IGNORE = fuzzing.unfuzzable_tests
-
 
 def pick_initial_contents():
     # if we use an initial wasm file's contents as the basis for the
@@ -334,25 +332,9 @@ def pick_initial_contents():
         # no longer exist, and we should just skip it.
         if not os.path.exists(test_name):
             return
-    if os.path.basename(test_name) in INITIAL_CONTENTS_IGNORE:
+    if not fuzzing.is_fuzzable(test_name):
         return
     assert os.path.exists(test_name)
-    # tests that check validation errors are not helpful for us
-    if '.fail.' in test_name:
-        print('initial contents is just a .fail test')
-        return
-    if os.path.basename(test_name) in [
-        # contains too many segments to run in a wasm VM
-        'limit-segments_disable-bulk-memory.wast',
-        # https://github.com/WebAssembly/binaryen/issues/3203
-        'simd.wast',
-        # corner cases of escaping of names is not interesting
-        'names.wast',
-        # huge amount of locals that make it extremely slow
-        'too_much_for_liveness.wasm'
-    ]:
-        print('initial contents is disallowed')
-        return
 
     if test_name.endswith('.wast'):
         # this can contain multiple modules, pick one

scripts/test/fuzzing.py

@@ -12,9 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import os
+
 
 # Tests that the fuzzers should not operate on.
-unfuzzable_tests = [
+unfuzzable = [
     # Float16 is still experimental.
     'f16.wast',
     # not all relaxed SIMD instructions are implemented in the interpreter
@@ -73,4 +75,20 @@
     'typed_continuations_contnew.wast',
     'typed_continuations_contbind.wast',
     'typed_continuations_suspend.wast',
+    # contains too many segments to run in a wasm VM
+    'limit-segments_disable-bulk-memory.wast',
+    # https://github.com/WebAssembly/binaryen/issues/7176
+    'names.wast',
+    # huge amount of locals that make it extremely slow
+    'too_much_for_liveness.wasm',
 ]
+
+
+def is_fuzzable(name):
+    name = os.path.basename(name)
+
+    # It makes no sense to fuzz things that check validation errors.
+    if '.fail.' in name:
+        return False
+
+    return name not in unfuzzable