Revert of [wasm] Call a runtime function for a MemorySize instruction.

src/runtime/runtime-wasm.cc

Index: src/runtime/runtime-wasm.cc
diff --git a/src/runtime/runtime-wasm.cc b/src/runtime/runtime-wasm.cc
index 443755bd4f5d709e4676d7729c38a4154484cf08..84bb819a3974679060a9ba91d90f7c319baf4a09 100644
--- a/src/runtime/runtime-wasm.cc
+++ b/src/runtime/runtime-wasm.cc
@@ -17,37 +17,6 @@
 
 namespace v8 {
 namespace internal {
-
-RUNTIME_FUNCTION(Runtime_WasmMemorySize) {
-  HandleScope scope(isolate);
-  DCHECK_EQ(0, args.length());
-
-  Handle<JSObject> module_instance;
-  {
-    // Get the module JSObject
-    DisallowHeapAllocation no_allocation;
-    const Address entry = Isolate::c_entry_fp(isolate->thread_local_top());
-    Address pc =
-        Memory::Address_at(entry + StandardFrameConstants::kCallerPCOffset);
-    Code* code =
-        isolate->inner_pointer_to_code_cache()->GetCacheEntry(pc)->code;
-    Object* owning_instance = wasm::GetOwningWasmInstance(code);
-    CHECK_NOT_NULL(owning_instance);
-    module_instance = handle(JSObject::cast(owning_instance), isolate);
-  }
-
-  // Get mem buffer associated with module object
-  MaybeHandle<JSArrayBuffer> maybe_mem_buffer =
-      wasm::GetInstanceMemory(isolate, module_instance);
-  Handle<JSArrayBuffer> old_buffer;
-  if (!maybe_mem_buffer.ToHandle(&old_buffer)) {
-    return *isolate->factory()->NewNumberFromInt(0);
-  } else {
-    uint32_t old_size = old_buffer->byte_length()->Number();
-    return *isolate->factory()->NewNumberFromInt(old_size /
-                                                 wasm::WasmModule::kPageSize);
-  }
-}
 
 RUNTIME_FUNCTION(Runtime_WasmGrowMemory) {
   HandleScope scope(isolate);