Convert SIMD wasm ops to runtime function calls

src/wasm/ast-decoder.cc

Index: src/wasm/ast-decoder.cc
diff --git a/src/wasm/ast-decoder.cc b/src/wasm/ast-decoder.cc
index b8a86c357badb86cda8244c2ecb9c4d878a3cafb..fccf29e9ee9dd56a2681182a96a5c6f655c73f9b 100644
--- a/src/wasm/ast-decoder.cc
+++ b/src/wasm/ast-decoder.cc
@@ -534,6 +534,8 @@ class SR_WasmDecoder : public WasmDecoder {
         return builder_->Float32Constant(0);
       case kAstF64:
         return builder_->Float64Constant(0);
+      case kAstS128:
+        return builder_->DefaultS128Value();
       default:
         UNREACHABLE();
         return nullptr;
@@ -602,6 +604,7 @@ class SR_WasmDecoder : public WasmDecoder {
     while (true) {  // decoding loop.
       int len = 1;
       WasmOpcode opcode = static_cast<WasmOpcode>(*pc_);
+      if (builder_) builder_->set_is_simd_function(WasmOpcodes::IsSimd(opcode));
       TRACE("  @%-6d #%02x:%-20s|", startrel(pc_), opcode,
             WasmOpcodes::ShortOpcodeName(opcode));