[wasm] Int64Lowering of Int64Sub on ia32 and arm.

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 cdb48671b4534da7b06b933cc973dc2f3957260a..125c940ce16ccd24c5a16ea32425e1d2eceb95f6 100644
--- a/src/compiler/wasm-compiler.cc
+++ b/src/compiler/wasm-compiler.cc
@@ -497,6 +497,9 @@ Node* WasmGraphBuilder::Binop(wasm::WasmOpcode opcode, Node* left,
       op = m->Int64Add();
       break;
     // kExprI64Sub:
+    case wasm::kExprI64Sub:
+      op = m->Int64Sub();
+      break;
     // kExprI64Mul:
     // kExprI64DivS:
     // kExprI64DivU:
@@ -561,9 +564,6 @@ Node* WasmGraphBuilder::Binop(wasm::WasmOpcode opcode, Node* left,
 #if WASM_64
     // Opcodes only supported on 64-bit platforms.
     // TODO(titzer): query the machine operator builder here instead of #ifdef.
-    case wasm::kExprI64Sub:
-      op = m->Int64Sub();
-      break;
     case wasm::kExprI64Mul:
       op = m->Int64Mul();
       break;