[turbofan] Implemented the TruncateFloat32ToInt64 TurboFan 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 f9487331166c2d7d26cc73c5cea0c3ac31525932..662cde72004f0ac8230c3881f89a89319e3beae3 100644
--- a/test/cctest/compiler/test-run-machops.cc
+++ b/test/cctest/compiler/test-run-machops.cc
@@ -5391,6 +5391,24 @@ TEST(RunBitcastFloat64ToInt64) {
 }
 
 
+TEST(RunTruncateFloat32ToInt64) {
+  BufferedRawMachineAssemblerTester<int64_t> m(kMachFloat32);
+  m.Return(m.TruncateFloat32ToInt64(m.Parameter(0)));
+
+  FOR_INT64_INPUTS(i) {
+    float input = static_cast<float>(*i);
+    if (input < 9223372036854775808.0 && input > -9223372036854775809.0) {
+      CHECK_EQ(static_cast<int64_t>(input), m.Call(input));
+    }
+  }
+  FOR_FLOAT32_INPUTS(j) {
+    if (*j < 9223372036854775808.0 && *j > -9223372036854775809.0) {
+      CHECK_EQ(static_cast<int64_t>(*j), m.Call(*j));
+    }
+  }
+}
+
+
 TEST(RunTruncateFloat64ToInt64) {
   BufferedRawMachineAssemblerTester<int64_t> m(kMachFloat64);
   m.Return(m.TruncateFloat64ToInt64(m.Parameter(0)));