Add more methods to gather target specific elf stuff

Support for .text relocations, implementing TargetELFWriter overloaded methods for x86/x86_64.
Use a map to track global values to their symbol table indexes
Code cleanup and small fixes



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73894 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/BinaryObject.h

@@ -61,6 +61,11 @@ public:
     return Relocations;
   }
 
+  /// hasRelocations - Return true if 'Relocations' is not empty
+  bool hasRelocations() const {
+    return !Relocations.empty();
+  }
+
   /// emitByte - This callback is invoked when a byte needs to be
   /// written to the data stream.
   inline void emitByte(uint8_t B) {
@@ -317,6 +322,7 @@ public:
   void addRelocation(const MachineRelocation& relocation) {
     Relocations.push_back(relocation);
   }
+
 };
 
 } // end namespace llvm