[objdump] Add --private-headers, -p.

This currently prints the ELF program headers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171649 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-objdump/llvm-objdump.h b/tools/llvm-objdump/llvm-objdump.h
index 9f5a8c3..ca7bced 100644
--- a/tools/llvm-objdump/llvm-objdump.h
+++ b/tools/llvm-objdump/llvm-objdump.h
@@ -19,6 +19,7 @@
 
 namespace object {
   class COFFObjectFile;
+  class ObjectFile;
   class RelocationRef;
 }
 class error_code;
@@ -32,6 +33,7 @@
 void DumpBytes(StringRef bytes);
 void DisassembleInputMachO(StringRef Filename);
 void printCOFFUnwindInfo(const object::COFFObjectFile* o);
+void printELFFileHeader(const object::ObjectFile *o);
 
 class StringRefMemoryObject : public MemoryObject {
   virtual void anchor();