Convert SIMD wasm ops to runtime function calls

src/wasm/wasm-macro-gen.h

Index: src/wasm/wasm-macro-gen.h
diff --git a/src/wasm/wasm-macro-gen.h b/src/wasm/wasm-macro-gen.h
index 83ac86a564c7fc82fdc20609f75f931aa94d8bbf..bcb6164dfa8b4aba50f424c0cf9206c11aca2868 100644
--- a/src/wasm/wasm-macro-gen.h
+++ b/src/wasm/wasm-macro-gen.h
@@ -570,6 +570,12 @@ class LocalDeclEncoder {
 #define WASM_I32_REINTERPRET_F32(x) x, kExprI32ReinterpretF32
 #define WASM_I64_REINTERPRET_F64(x) x, kExprI64ReinterpretF64
 
+//------------------------------------------------------------------------------
+// Type conversions.
+//------------------------------------------------------------------------------
+#define WASM_SIMD_I32x4_SPLAT(x) kExprI32x4S128Splat, x
+#define WASM_SIMD_I32x4_EXTRACT_LANE(x, y) kExprI32x4S128ExtractLane, x, y
+
 #define SIG_ENTRY_v_v kWasmFunctionTypeForm, 0, 0
 #define SIZEOF_SIG_ENTRY_v_v 3