[turbofan] Add backend support for float32.

src/compiler/raw-machine-assembler.h

Index: src/compiler/raw-machine-assembler.h
diff --git a/src/compiler/raw-machine-assembler.h b/src/compiler/raw-machine-assembler.h
index a4af55a68bc2747b091a175467a3157d6edccfa8..cad9ae922208dbdbac6d4f7a70a69f3d7c2c35de 100644
--- a/src/compiler/raw-machine-assembler.h
+++ b/src/compiler/raw-machine-assembler.h
@@ -344,6 +344,9 @@ class RawMachineAssembler : public GraphBuilder {
   }
 
   // Conversions.
+  Node* ChangeFloat32ToFloat64(Node* a) {
+    return NewNode(machine()->ChangeFloat32ToFloat64(), a);
+  }
   Node* ChangeInt32ToFloat64(Node* a) {
     return NewNode(machine()->ChangeInt32ToFloat64(), a);
   }
@@ -362,6 +365,9 @@ class RawMachineAssembler : public GraphBuilder {
   Node* ChangeUint32ToUint64(Node* a) {
     return NewNode(machine()->ChangeUint32ToUint64(), a);
   }
+  Node* TruncateFloat64ToFloat32(Node* a) {
+    return NewNode(machine()->TruncateFloat64ToFloat32(), a);
+  }
   Node* TruncateFloat64ToInt32(Node* a) {
     return NewNode(machine()->TruncateFloat64ToInt32(), a);
   }