Write out global initializers and data rel directly to ELF file.

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 and LoweringContext
@@ skipping 239 matching lines @@
   TargetGlobalInitLowering &operator=(const TargetGlobalInitLowering &) =
       delete;
 
 public:
   static TargetGlobalInitLowering *createLowering(TargetArch Target,
                                                   GlobalContext *Ctx);
   virtual ~TargetGlobalInitLowering();
 
   virtual void lower(const VariableDeclaration &Var) = 0;
 
+  virtual void lowerGlobalsELF(const VariableDeclarationList &Vars) = 0;

[Jim Stichnoth, 2015/01/27 16:44:55]

After you rebase, you'll find a new method here - lowerConstants().  Some
renaming or refactoring may be in order, I'm not completely sure at this point.

[jvoung (off chromium), 2015/01/28 17:46:22]

lower() has also become lowerInit() and the class is now TargetGlobalLowering.
I've renamed this to lowerInitELF, but yeah... the names could be better?

[Jim Stichnoth, 2015/01/28 20:35:08]

Yeah... If you feel inspired, go ahead and make the changes in this CL.  They
should be pretty limited.

[jvoung (off chromium), 2015/01/28 23:37:52]

I guess I kind of like lowerGlobal() since it's called from
Translator::lowerGlobals()... though that's a little redundant w/ the "Global"
in TargetGlobalLowering.

Also pluralized the ELF version since it takes the whole list.

[Jim Stichnoth, 2015/01/29 00:38:14]

OK.  I also should have explicitly mentioned that I also think
"TargetGlobalLowering" isn't necessary the best name choice given its current
functionality.  I wonder if something like "TargetDataLowering" would be better?
 Or other ideas?

[jvoung (off chromium), 2015/01/29 19:33:03]

I was actually thinking TargetDataLowering also. I'll make that change for now.

+
 protected:
   TargetGlobalInitLowering(GlobalContext *Ctx) : Ctx(Ctx) {}
   GlobalContext *Ctx;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERING_H