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

src/compiler/wasm-compiler.cc

Index: src/compiler/wasm-compiler.cc
diff --git a/src/compiler/wasm-compiler.cc b/src/compiler/wasm-compiler.cc
index b003e9968aca0a218ae7a6f9d11db072c80c1e99..dac9eec7a75a9ee22c49e7ee7ec114822a7f86ef 100644
--- a/src/compiler/wasm-compiler.cc
+++ b/src/compiler/wasm-compiler.cc
@@ -2759,27 +2759,8 @@
 }
 
 Node* WasmGraphBuilder::CurrentMemoryPages() {
-  Runtime::FunctionId function_id = Runtime::kWasmMemorySize;
-  const Runtime::Function* function = Runtime::FunctionForId(function_id);
-  CallDescriptor* desc = Linkage::GetRuntimeCallDescriptor(
-      jsgraph()->zone(), function_id, function->nargs, Operator::kNoThrow,
-      CallDescriptor::kNoFlags);
-  wasm::ModuleEnv* module = module_;
-  Node* inputs[] = {
-      jsgraph()->CEntryStubConstant(function->result_size),  // C entry
-      jsgraph()->ExternalConstant(
-          ExternalReference(function_id, jsgraph()->isolate())),  // ref
-      jsgraph()->Int32Constant(function->nargs),                  // arity
-      jsgraph()->HeapConstant(module->instance->context),         // context
-      *effect_,
-      *control_};
-  Node* call = graph()->NewNode(jsgraph()->common()->Call(desc),
-                                static_cast<int>(arraysize(inputs)), inputs);
-
-  Node* result = BuildChangeSmiToInt32(call);
-
-  *effect_ = call;
-  return result;
+  return graph()->NewNode(jsgraph()->machine()->Word32Shr(), MemSize(0),
+                          jsgraph()->Int32Constant(16));
 }
 
 Node* WasmGraphBuilder::MemSize(uint32_t offset) {