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 85534b071ab8aadf6ac16b93144c33b6997ec2dc..24fec12c2a5650c1939187f2a2f23b21f8496492 100644
--- a/src/compiler/wasm-compiler.h
+++ b/src/compiler/wasm-compiler.h
@@ -119,8 +119,9 @@ class WasmGraphBuilder {
   Node* LoadGlobal(uint32_t index);
   Node* StoreGlobal(uint32_t index, Node* val);
   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, bool aligned);

[titzer, 2016/03/22 15:00:20]

This alignment parameter will be more than a boolean. It's actually a power two,
under the theory that we can generate better code for a word32 load aligned on a
2-byte boundary.

+  Node* StoreMem(MachineType type, Node* index, uint32_t offset, bool aligned,
+                 Node* val);
 
   static void PrintDebugName(Node* node);