Subzero: Emit ARM build-attributes in the file scope (as header).

src/IceTargetLoweringX8632.h

 //===- subzero/src/IceTargetLoweringX8632.h - x86-32 lowering ---*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares the TargetLoweringX8632 class, which
@@ skipping 579 matching lines @@
 
 protected:
   explicit TargetDataX8632(GlobalContext *Ctx);
 
 private:
   void lowerGlobal(const VariableDeclaration &Var) const;
   ~TargetDataX8632() override {}
   template <typename T> static void emitConstantPool(GlobalContext *Ctx);
 };
 
+class TargetHeaderX8632 : public TargetHeaderLowering {
+  TargetHeaderX8632() = delete;
+  TargetHeaderX8632(const TargetHeaderX8632 &) = delete;
+  TargetHeaderX8632 &operator=(const TargetHeaderX8632 &) = delete;
+
+public:
+  static TargetHeaderLowering *create(GlobalContext *Ctx) {
+    return new TargetHeaderX8632(Ctx);
+  }
+
+protected:
+  explicit TargetHeaderX8632(GlobalContext *Ctx);
+
+private:
+  ~TargetHeaderX8632() final {}
+};
+
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGX8632_H