[turbofan] Implemented the optional Float32RoundTiesEven operator.

test/cctest/compiler/test-run-machops.cc

Index: test/cctest/compiler/test-run-machops.cc
diff --git a/test/cctest/compiler/test-run-machops.cc b/test/cctest/compiler/test-run-machops.cc
index 56f1c4f6fe038eeea5dd4fb7c2c529fa422c595d..f9487331166c2d7d26cc73c5cea0c3ac31525932 100644
--- a/test/cctest/compiler/test-run-machops.cc
+++ b/test/cctest/compiler/test-run-machops.cc
@@ -5195,6 +5195,15 @@ TEST(RunFloat64RoundUp) {
 }
 
 
+TEST(RunFloat32RoundTiesEven) {
+  BufferedRawMachineAssemblerTester<float> m(kMachFloat32);
+  if (!m.machine()->Float32RoundTiesEven().IsSupported()) return;
+  m.Return(m.Float32RoundTiesEven(m.Parameter(0)));
+
+  FOR_FLOAT32_INPUTS(i) { CheckFloatEq(nearbyint(*i), m.Call(*i)); }
+}
+
+
 TEST(RunFloat64RoundTiesEven) {
   BufferedRawMachineAssemblerTester<double> m(kMachFloat64);
   if (!m.machine()->Float64RoundTiesEven().IsSupported()) return;