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

src/assembler_ia32.h

Index: src/assembler_ia32.h
diff --git a/src/assembler_ia32.h b/src/assembler_ia32.h
index a7ffc9e1ec539ec748f6ba6c3874fa95afe47f7b..d38dca78b897a3fa3ab9e6b8c9d7203cc2a33109 100644
--- a/src/assembler_ia32.h
+++ b/src/assembler_ia32.h
@@ -56,12 +56,6 @@ public:
         DisplacementRelocation(Kind, Sym);
   }
 
-  void Process(const MemoryRegion &region, intptr_t position) override {
-    (void)region;
-    (void)position;
-    llvm_unreachable("We might not be using this Process() method later.");
-  }
-
 private:
   DisplacementRelocation(FixupKind Kind, const ConstantRelocatable *Sym)
       : AssemblerFixup(Kind, Sym) {}
@@ -374,6 +368,15 @@ public:
   static const bool kNearJump = true;
   static const bool kFarJump = false;
 
+  void alignFunction() override;
+
+  SizeT getBundleAlignLog2Bytes() const override { return 5; }
+
+  llvm::ArrayRef<uint8_t> getNonExecBundlePadding() const override {
+    static const uint8_t Padding[] = {0xF4};
+    return llvm::ArrayRef<uint8_t>(Padding, 1);
+  }
+
   Label *GetOrCreateCfgNodeLabel(SizeT NodeNumber);
   void BindCfgNodeLabel(SizeT NodeNumber) override;
   Label *GetOrCreateLocalLabel(SizeT Number);
@@ -825,10 +828,6 @@ public:
 
   intptr_t CodeSize() const { return buffer_.Size(); }
 
-  void FinalizeInstructions(const MemoryRegion &region) {
-    buffer_.FinalizeInstructions(region);
-  }
-
 private:
   inline void EmitUint8(uint8_t value);
   inline void EmitInt16(int16_t value);