Subzero: Add basic ELFObjectWriter (text section, symtab, strtab, headers)

src/IceGlobalContext.h

Index: src/IceGlobalContext.h
diff --git a/src/IceGlobalContext.h b/src/IceGlobalContext.h
index eeed6afe726185d08a65cb03c80bf8d73086d611..cd2cb5700caa27999e3656d0eeed846808e804eb 100644
--- a/src/IceGlobalContext.h
+++ b/src/IceGlobalContext.h
@@ -22,6 +22,7 @@
 
 #include "IceDefs.h"
 #include "IceClFlags.h"
+#include "IceELFObjectWriter.h"
 #include "IceIntrinsics.h"
 #include "IceRNG.h"
 #include "IceTimerTree.h"
@@ -75,8 +76,8 @@ class GlobalContext {
 
 public:
   GlobalContext(llvm::raw_ostream *OsDump, llvm::raw_ostream *OsEmit,
-                VerboseMask Mask, TargetArch Arch, OptLevel Opt,
-                IceString TestPrefix, const ClFlags &Flags);
+                ELFStreamer *ELFStreamer, VerboseMask Mask, TargetArch Arch,
+                OptLevel Opt, IceString TestPrefix, const ClFlags &Flags);
   ~GlobalContext();
 
   // Returns true if any of the specified options in the verbose mask
@@ -158,6 +159,8 @@ public:
   // translation.
   RandomNumberGenerator &getRNG() { return RNG; }
 
+  ELFObjectWriter *getObjectWriter() const { return ObjectWriter.get(); }
+
   // Reset stats at the beginning of a function.
   void resetStats() { StatsFunction.reset(); }
   void dumpStats(const IceString &Name, bool Final = false);
@@ -212,6 +215,7 @@ private:
   const ClFlags &Flags;
   bool HasEmittedFirstMethod;
   RandomNumberGenerator RNG;
+  std::unique_ptr<ELFObjectWriter> ObjectWriter;
   CodeStats StatsFunction;
   CodeStats StatsCumulative;
   std::vector<TimerStack> Timers;