[wasm] Allocate a single script per wasm module

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 133a1fe0d14c66da4b677e72af981db0bc2699c0..c52e1a1296cefafd18ead753bba7483f1463565b 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -5915,10 +5915,8 @@ ACCESSORS(Script, shared_function_infos, Object, kSharedFunctionInfosOffset)
 SMI_ACCESSORS(Script, flags, kFlagsOffset)
 ACCESSORS(Script, source_url, Object, kSourceUrlOffset)
 ACCESSORS(Script, source_mapping_url, Object, kSourceMappingUrlOffset)
-ACCESSORS_CHECKED(Script, wasm_instance, JSObject, kEvalFromSharedOffset,
+ACCESSORS_CHECKED(Script, wasm_compiled_module, Object, kEvalFromSharedOffset,
                   this->type() == TYPE_WASM)
-SMI_ACCESSORS_CHECKED(Script, wasm_function_index, kEvalFromPositionOffset,
-                      this->type() == TYPE_WASM)
 
 Script::CompilationType Script::compilation_type() {
   return BooleanBit::get(flags(), kCompilationTypeBit) ?