Fixing more wasm warnings.

src/wasm/wasm-opcodes.cc

Index: src/wasm/wasm-opcodes.cc
diff --git a/src/wasm/wasm-opcodes.cc b/src/wasm/wasm-opcodes.cc
index 428fdd2dc42fcace31b89bb2bb430213ad51892a..25eef034d7f3e7b86d6d9c78d52b14fdc83c38c9 100644
--- a/src/wasm/wasm-opcodes.cc
+++ b/src/wasm/wasm-opcodes.cc
@@ -73,8 +73,8 @@ FunctionSig* WasmOpcodes::Signature(WasmOpcode opcode) {
 
 
 bool WasmOpcodes::IsSupported(WasmOpcode opcode) {
-  switch (opcode) {
 #if !WASM_64
+  switch (opcode) {
     // Opcodes not supported on 32-bit platforms.
     case kExprI64Add:
     case kExprI64Sub:
@@ -120,11 +120,13 @@ bool WasmOpcodes::IsSupported(WasmOpcode opcode) {
     case kExprI64UConvertF32:
     case kExprI64UConvertF64:
 
-#endif
       return false;
     default:
       return true;
   }
+#else
+  return true;
+#endif
 }
 }  // namespace wasm
 }  // namespace internal