[turbofan] Remove deprecated code from RawMachineAssembler.

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 17dd5fd75f7fa31c44b3910f7b6f626289c80c03..5ac9b1341f57bf62d6307d29762e4c83768fc9db 100644
--- a/src/compiler/raw-machine-assembler.h
+++ b/src/compiler/raw-machine-assembler.h
@@ -34,13 +34,7 @@ class RawMachineAssembler {
     Label() : block_(NULL), used_(false), bound_(false) {}
     ~Label() { DCHECK(bound_ || !used_); }
 
-    BasicBlock* block() { return block_; }
-
    private:
-    // Private constructor for exit label.
-    explicit Label(BasicBlock* block)
-        : block_(block), used_(false), bound_(false) {}
-
     BasicBlock* block_;
     bool used_;
     bool bound_;