Subzero: Allow overriding command-line args from the browser.

src/IceCompileServer.cpp

 //===- subzero/src/IceCompileServer.cpp - 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 71 matching lines @@
   for (size_t i = 0; i < Len; ++i)
     Buf[i] = BitcodeBuffer[Cursor + i];
   Cursor += Len;
   return Len;
 }
 
 std::unique_ptr<Ostream> makeStream(const std::string &Filename,
                                     std::error_code &EC) {
   if (Filename == "-") {
     return std::unique_ptr<Ostream>(new llvm::raw_os_ostream(std::cout));
+  } else if (Filename == "/dev/stderr") {
+    return std::unique_ptr<Ostream>(new llvm::raw_os_ostream(std::cerr));
   } else {
     return std::unique_ptr<Ostream>(
         new llvm::raw_fd_ostream(Filename, EC, llvm::sys::fs::F_None));
   }
 }
 
 ErrorCodes getReturnValue(ErrorCodes Val) {
   if (getFlags().getAlwaysExitSuccess())
     return EC_None;
   return Val;
@@ skipping 136 matching lines @@
   } else {
     getCompiler().run(Flags, *Ctx.get(), std::move(InputStream));
   }
   transferErrorCode(
       getReturnValue(static_cast<ErrorCodes>(Ctx->getErrorStatus()->value())));
   Ctx->dumpConstantLookupCounts();
   Ctx->dumpStrings();
 }
 
 } // end of namespace Ice