Refactor Subzero initialization and add a browser callback handler.

src/IceClFlags.h

 //===- subzero/src/IceClFlags.h - Cl Flags for translation ------*- 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 command line flags controlling translation.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICECLFLAGS_H
 #define SUBZERO_SRC_ICECLFLAGS_H
 
+#include "IceDefs.h"
 #include "IceTypes.h"
 
 namespace Ice {
 
+class ClFlagsExtra;
+
 class ClFlags {
   ClFlags(const ClFlags &) = delete;
   ClFlags &operator=(const ClFlags &) = delete;
 
 public:
   ClFlags()
       : // bool fields.
         AllowErrorRecovery(false),
         AllowUninitializedGlobals(false), DataSections(false),
         DecorateAsm(false), DisableInternal(false), DisableIRGeneration(false),
         DisableTranslation(false), DumpStats(false), FunctionSections(false),
         GenerateUnitTestMessages(false), PhiEdgeSplit(false),
         RandomNopInsertion(false), RandomRegAlloc(false),
         SubzeroTimingEnabled(false), TimeEachFunction(false),
         UseSandboxing(false),
-        // Enum and integer fields
+        // Enum and integer fields.
         Opt(Opt_m1), OutFileType(FT_Iasm), RandomMaxNopsPerInstruction(0),
         RandomNopProbabilityAsPercentage(0), TArch(TargetArch_NUM),
         VMask(IceV_None),
         // IceString fields.
         DefaultFunctionPrefix(""), DefaultGlobalPrefix(""), TestPrefix(""),
         TimingFocusOn(""), TranslateOnly(""), VerboseFocusOn(""),
         // size_t and 64-bit fields.
         NumTranslationThreads(0), RandomSeed(0) {}
 
+  static void parseFlags(int argc, char *argv[]);
+  static void getParsedClFlags(ClFlags &OutFlags);
+  static void getParsedClFlagsExtra(ClFlagsExtra &OutFlagsExtra);
+
   // bool accessors.
 
   bool getAllowErrorRecovery() const { return AllowErrorRecovery; }
   void setAllowErrorRecovery(bool NewValue) { AllowErrorRecovery = NewValue; }
 
   bool getAllowUninitializedGlobals() const {
     return AllowUninitializedGlobals;
   }
   void setAllowUninitializedGlobals(bool NewValue) {
     AllowUninitializedGlobals = NewValue;
@@ skipping 155 matching lines @@
   IceString TranslateOnly;
   IceString VerboseFocusOn;
 
   size_t NumTranslationThreads; // 0 means completely sequential
   uint64_t RandomSeed;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICECLFLAGS_H