Implement optional turbofan UnalignedLoad and UnalignedStore operators

src/compiler/wasm-compiler.h

Index: src/compiler/wasm-compiler.h
diff --git a/src/compiler/wasm-compiler.h b/src/compiler/wasm-compiler.h
index bbcafa72960a786132ad01731ee49d7354790c57..8d8cb3c4a3cac0d3be94c5372c546345cce668f8 100644
--- a/src/compiler/wasm-compiler.h
+++ b/src/compiler/wasm-compiler.h
@@ -118,9 +118,14 @@ class WasmGraphBuilder {
   Node* MemSize(uint32_t offset);
   Node* LoadGlobal(uint32_t index);
   Node* StoreGlobal(uint32_t index, Node* val);
+  Node* BuildUnalignedLoad(wasm::LocalType type, MachineType memtype,
+                           Node* index, uint32_t offset);
   Node* LoadMem(wasm::LocalType type, MachineType memtype, Node* index,
-                uint32_t offset);
-  Node* StoreMem(MachineType type, Node* index, uint32_t offset, Node* val);
+                uint32_t offset, uint32_t alignment);
+  Node* BuildUnalignedStore(MachineType memtype, Node* index, uint32_t offset,
+                            uint32_t alignment, Node* val);
+  Node* StoreMem(MachineType type, Node* index, uint32_t offset,
+                 uint32_t alignment, Node* val);
 
   static void PrintDebugName(Node* node);