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

src/IceTargetLowering.h

 //===- subzero/src/IceTargetLowering.h - Lowering interface -----*- 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 TargetLowering, LoweringContext, and
@@ skipping 371 matching lines @@
 
   virtual void
   lowerGlobals(std::unique_ptr<VariableDeclarationList> Vars) const = 0;
   virtual void lowerConstants() const = 0;
 
 protected:
   explicit TargetDataLowering(GlobalContext *Ctx) : Ctx(Ctx) {}
   GlobalContext *Ctx;
 };
 
+// TargetHeaderLowering is used to "lower" the header of an output file.
+// It writes out the target-specific header attributes. E.g., for ARM
+// this writes out the build attributes (float ABI, etc.).
+class TargetHeaderLowering {
+  TargetHeaderLowering() = delete;
+  TargetHeaderLowering(const TargetHeaderLowering &) = delete;
+  TargetHeaderLowering &operator=(const TargetHeaderLowering &) = delete;
+
+public:
+  static std::unique_ptr<TargetHeaderLowering>
+  createLowering(GlobalContext *Ctx);
+  virtual ~TargetHeaderLowering();
+
+  virtual void lower() {}
+
+protected:
+  explicit TargetHeaderLowering(GlobalContext *Ctx) : Ctx(Ctx) {}
+  GlobalContext *Ctx;
+};
+
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERING_H