[turbofan] Implemented the optional Float32RoundTruncate operator.

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 fc901253e5859b122f590155fffb5c8948b4af57..376dbe5cadec2067d9883ac706a5836ff73e5270 100644
--- a/src/compiler/raw-machine-assembler.h
+++ b/src/compiler/raw-machine-assembler.h
@@ -495,6 +495,9 @@ class RawMachineAssembler {
   Node* Float64RoundUp(Node* a) {
     return AddNode(machine()->Float64RoundUp().op(), a);
   }
+  Node* Float32RoundTruncate(Node* a) {
+    return AddNode(machine()->Float32RoundTruncate().op(), a);
+  }
   Node* Float64RoundTruncate(Node* a) {
     return AddNode(machine()->Float64RoundTruncate().op(), a);
   }