[wasm] Implement I32x4ReplaceLane, I32x4Add, I32x4Sub.

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 dac9eec7a75a9ee22c49e7ee7ec114822a7f86ef..7877814450f7dca43e08ad7d4044e378b6e4ebcd 100644
--- a/src/compiler/wasm-compiler.cc
+++ b/src/compiler/wasm-compiler.cc
@@ -3019,17 +3019,18 @@ Node* WasmGraphBuilder::SimdOp(wasm::WasmOpcode opcode,
     case wasm::kExprI32x4Splat:
       return graph()->NewNode(jsgraph()->machine()->CreateInt32x4(), inputs[0],
                               inputs[0], inputs[0], inputs[0]);
-    default:
-      return graph()->NewNode(UnsupportedOpcode(opcode), nullptr);
-  }
-}
-
-Node* WasmGraphBuilder::SimdExtractLane(wasm::WasmOpcode opcode, uint8_t lane,
-                                        Node* input) {
-  switch (opcode) {
     case wasm::kExprI32x4ExtractLane:
-      return graph()->NewNode(jsgraph()->machine()->Int32x4ExtractLane(), input,
-                              Int32Constant(lane));
+      return graph()->NewNode(jsgraph()->machine()->Int32x4ExtractLane(),
+                              inputs[0], inputs[1]);
+    case wasm::kExprI32x4ReplaceLane:
+      return graph()->NewNode(jsgraph()->machine()->Int32x4ReplaceLane(),
+                              inputs[0], inputs[1], inputs[2]);
+    case wasm::kExprI32x4Add:
+      return graph()->NewNode(jsgraph()->machine()->Int32x4Add(), inputs[0],
+                              inputs[1]);
+    case wasm::kExprI32x4Sub:
+      return graph()->NewNode(jsgraph()->machine()->Int32x4Sub(), inputs[0],
+                              inputs[1]);
     default:
       return graph()->NewNode(UnsupportedOpcode(opcode), nullptr);
   }