[wasm] Mask shift counts on architectures that don't implicitly mask.

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 b5710b8e29ef1153c83868bd7494f61671c49f40..bbcafa72960a786132ad01731ee49d7354790c57 100644
--- a/src/compiler/wasm-compiler.h
+++ b/src/compiler/wasm-compiler.h
@@ -164,6 +164,9 @@ class WasmGraphBuilder {
   Node* MemBuffer(uint32_t offset);
   void BoundsCheckMem(MachineType memtype, Node* index, uint32_t offset);
 
+  Node* MaskShiftCount32(Node* node);
+  Node* MaskShiftCount64(Node* node);
+
   Node* BuildCCall(MachineSignature* sig, Node** args);
   Node* BuildWasmCall(wasm::FunctionSig* sig, Node** args);