[turbofan] Add backend support for float32.

src/compiler/arm64/instruction-selector-arm64.cc

Index: src/compiler/arm64/instruction-selector-arm64.cc
diff --git a/src/compiler/arm64/instruction-selector-arm64.cc b/src/compiler/arm64/instruction-selector-arm64.cc
index 472ce6fe78a10ddc4fe6a79795c826edcb314ff4..528d18db969a153fdd0e1812bbbc19a84337a736 100644
--- a/src/compiler/arm64/instruction-selector-arm64.cc
+++ b/src/compiler/arm64/instruction-selector-arm64.cc
@@ -432,6 +432,13 @@ void InstructionSelector::VisitInt64UMod(Node* node) {
 }
 
 
+void InstructionSelector::VisitChangeFloat32ToFloat64(Node* node) {
+  Arm64OperandGenerator g(this);
+  Emit(kArm64Float32ToFloat64, g.DefineAsRegister(node),
+       g.UseRegister(node->InputAt(0)));
+}
+
+
 void InstructionSelector::VisitChangeInt32ToFloat64(Node* node) {
   Arm64OperandGenerator g(this);
   Emit(kArm64Int32ToFloat64, g.DefineAsRegister(node),
@@ -472,6 +479,13 @@ void InstructionSelector::VisitChangeUint32ToUint64(Node* node) {
 }
 
 
+void InstructionSelector::VisitTruncateFloat64ToFloat32(Node* node) {
+  Arm64OperandGenerator g(this);
+  Emit(kArm64Float64ToFloat32, g.DefineAsRegister(node),
+       g.UseRegister(node->InputAt(0)));
+}
+
+
 void InstructionSelector::VisitTruncateInt64ToInt32(Node* node) {
   Arm64OperandGenerator g(this);
   Emit(kArm64Mov32, g.DefineAsRegister(node), g.UseRegister(node->InputAt(0)));