Revert of [turbofan] Implemented the TruncateFloat32ToInt64 TurboFan operator.

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index f38e1ff514087cad7b65b20ea08fe40acf5383db..1e957cd6d4f8f314f5d43e43f13ae70ef6101def 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -954,26 +954,6 @@
     vcvttsd2si(dst, src);
   } else {
     cvttsd2si(dst, src);
-  }
-}
-
-
-void MacroAssembler::Cvttss2siq(Register dst, XMMRegister src) {
-  if (CpuFeatures::IsSupported(AVX)) {
-    CpuFeatureScope scope(this, AVX);
-    vcvttss2siq(dst, src);
-  } else {
-    cvttss2siq(dst, src);
-  }
-}
-
-
-void MacroAssembler::Cvttss2siq(Register dst, const Operand& src) {
-  if (CpuFeatures::IsSupported(AVX)) {
-    CpuFeatureScope scope(this, AVX);
-    vcvttss2siq(dst, src);
-  } else {
-    cvttss2siq(dst, src);
   }
 }