Subzero: Refactor x86 register definitions to use the alias mechanism.

src/IceBrowserCompileServer.cpp

 //===- subzero/src/IceBrowserCompileServer.cpp - Browser compile server ---===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 76 matching lines @@
   return nullptr;
 }
 
 struct nacl_irt_pnacl_compile_funcs SubzeroCallbacks {
   &onInitCallback, &onDataCallback, &onEndCallback
 };
 
 std::unique_ptr<llvm::raw_fd_ostream> getOutputStream(int FD) {
   if (FD <= 0)
     llvm::report_fatal_error("Invalid output FD");
-  const bool CloseOnDtor = true;
-  const bool Unbuffered = false;
+  constexpr bool CloseOnDtor = true;
+  constexpr bool Unbuffered = false;
   return std::unique_ptr<llvm::raw_fd_ostream>(
       new llvm::raw_fd_ostream(FD, CloseOnDtor, Unbuffered));
 }
 
 void fatalErrorHandler(void *UserData, const std::string &Reason,
                        bool GenCrashDialog) {
   (void)GenCrashDialog;
   BrowserCompileServer *Server =
       reinterpret_cast<BrowserCompileServer *>(UserData);
   Server->setFatalError(Reason);
@@ skipping 80 matching lines @@
     this->getCompiler().run(ExtraFlags, *Ctx.get(),
                             // Retain original reference, but the compiler
                             // (LLVM's MemoryObject) wants to handle deletion.
                             std::unique_ptr<llvm::DataStreamer>(InputStream));
   });
 }
 
 } // end of namespace Ice
 
 #endif // PNACL_BROWSER_TRANSLATOR