[wasm] Implemented F32Trunc as a turbofan graph based on int32 instructions.

test/cctest/wasm/test-run-wasm.cc

Index: test/cctest/wasm/test-run-wasm.cc
diff --git a/test/cctest/wasm/test-run-wasm.cc b/test/cctest/wasm/test-run-wasm.cc
index 196aea4f57e9aebf872d4f4c5805b50992300e74..4873f570b72eecb66b367cebca7e68c7670a0d8d 100644
--- a/test/cctest/wasm/test-run-wasm.cc
+++ b/test/cctest/wasm/test-run-wasm.cc
@@ -2933,6 +2933,14 @@ TEST(Run_Wasm_MultipleCallIndirect) {
 }
 
 
+TEST(Run_Wasm_F32Trunc) {
+  WasmRunner<float> r(MachineType::Float32());
+  BUILD(r, WASM_F32_TRUNC(WASM_GET_LOCAL(0)));
+
+  FOR_FLOAT32_INPUTS(i) { CheckFloatEq(trunc(*i), r.Call(*i)); }
+}
+
+
 // TODO(titzer): Fix for nosee4 and re-enable.
 #if 0
 
@@ -2952,14 +2960,6 @@ TEST(Run_Wasm_F32Ceil) {
 }
 
 
-TEST(Run_Wasm_F32Trunc) {
-  WasmRunner<float> r(MachineType::Float32());
-  BUILD(r, WASM_F32_TRUNC(WASM_GET_LOCAL(0)));
-
-  FOR_FLOAT32_INPUTS(i) { CheckFloatEq(trunc(*i), r.Call(*i)); }
-}
-
-
 TEST(Run_Wasm_F32NearestInt) {
   WasmRunner<float> r(MachineType::Float32());
   BUILD(r, WASM_F32_NEARESTINT(WASM_GET_LOCAL(0)));