[turbofan] Implement rounding of floats on x64 and ia32 without sse4.1.

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 c6f529e35a12d5addc0a56b94634ec9b14c4696e..0a4684065e407c50110c5aaed0d571849cbba8ab 100644
--- a/test/cctest/wasm/test-run-wasm.cc
+++ b/test/cctest/wasm/test-run-wasm.cc
@@ -3282,9 +3282,6 @@ TEST(Run_Wasm_MultipleCallIndirect) {
 }
 
 
-// TODO(titzer): Fix for nosee4 and re-enable.
-#if 0
-
 TEST(Run_Wasm_F32Floor) {
   WasmRunner<float> r(MachineType::Float32());
   BUILD(r, WASM_F32_FLOOR(WASM_GET_LOCAL(0)));
@@ -3348,8 +3345,6 @@ TEST(Run_Wasm_F64NearestInt) {
   FOR_FLOAT64_INPUTS(i) { CheckDoubleEq(nearbyint(*i), r.Call(*i)); }
 }
 
-#endif
-
 
 TEST(Run_Wasm_F32Min) {
   WasmRunner<float> r(MachineType::Float32(), MachineType::Float32());