Remove some unneeded testing (#20787)

Add a new @only_wasm2js decoration for tests that test basic codegen that
makes sense to do only in wasm2js (as for the wasm backend in general we
assume basic codegen is tested in LLVM; we could do the same for wasm2js
which is in Binaryen, but I think some of the Emscripten tests are a good
complement to there).

Author: kripken

.circleci/config.yml

@@ -558,7 +558,6 @@ jobs:
             core2s.test_module_wasm_memory
             wasm2js3.test_memorygrowth_2
             wasmfs.test_hello_world
-            wasmfs.test_hello_world_standalone
             wasmfs.test_unistd_links*
             wasmfs.test_atexit_standalone
             wasmfs.test_emscripten_get_now

test/core/test_sintvars.c

@@ -134,6 +134,14 @@ def decorated(f):
   return decorated
 
 
+def only_wasm2js(note=''):
+  assert not callable(note)
+
+  def decorated(f):
+    return skip_if(f, 'is_wasm2js', note, negate=True)
+  return decorated
+
+
 def also_with_noderawfs(func):
   assert callable(func)
 
@@ -406,8 +414,6 @@ def get_bullet_library(self, use_cmake):
                             configure_args=configure_args,
                             cache_name_extra=configure_commands[0])
 
-  @also_with_standalone_wasm()
-  @also_with_wasmfs
   def test_hello_world(self):
     self.do_core_test('test_hello_world.c')
 
@@ -426,14 +432,10 @@ def test_hello_argc_pthreads(self):
     self.set_setting('EXIT_RUNTIME')
     self.do_core_test('test_hello_argc.c', args=['hello', 'world'])
 
-  @also_with_wasmfs
+  @only_wasm2js('test shifts etc. on 64-bit integers')
   def test_intvars(self):
     self.do_core_test('test_intvars.cpp')
 
-  @also_with_wasmfs
-  def test_sintvars(self):
-    self.do_core_test('test_sintvars.c')
-
   def test_int53(self):
     if common.EMTEST_REBASELINE:
       self.run_process([EMCC, test_file('core/test_int53.c'), '-o', 'a.js', '-DGENERATE_ANSWERS'] + self.emcc_args)