Remove is_wasm_only() which only made sense on fastcomp (#12067)

Author: kripken

emcc.py

@@ -1780,9 +1780,6 @@ def include_and_export(name):
     if shared.Settings.USE_PTHREADS:
       newargs.append('-pthread')
 
-    if not shared.Settings.LEGALIZE_JS_FFI:
-      assert building.is_wasm_only(), 'LEGALIZE_JS_FFI incompatible with RUNNING_JS_OPTS.'
-
     # check if we can address the 2GB mark and higher: either if we start at
     # 2GB, or if we allow growth to either any amount or to 2GB or more.
     if shared.Settings.INITIAL_MEMORY > 2 * 1024 * 1024 * 1024 or \

tools/building.py

@@ -856,14 +856,6 @@ def can_inline():
   return Settings.INLINING_LIMIT == 0
 
 
-def is_wasm_only():
-  # not even wasm, much less wasm-only
-  if not Settings.WASM:
-    return False
-  # llvm backend can only ever produce wasm
-  return True
-
-
 def get_safe_internalize():
   if Settings.LINKABLE:
     return [] # do not internalize anything