Introduce convenience typedefs for the 4 ELF object types.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181509 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-objdump/ELFDump.cpp b/tools/llvm-objdump/ELFDump.cpp
index bd15231..b952673 100644
--- a/tools/llvm-objdump/ELFDump.cpp
+++ b/tools/llvm-objdump/ELFDump.cpp
@@ -79,22 +79,18 @@
 
 void llvm::printELFFileHeader(const object::ObjectFile *Obj) {
   // Little-endian 32-bit
-  if (const ELFObjectFile<ELFType<support::little, 4, false> > *ELFObj =
-          dyn_cast<ELFObjectFile<ELFType<support::little, 4, false> > >(Obj))
+  if (const ELF32LEObjectFile *ELFObj = dyn_cast<ELF32LEObjectFile>(Obj))
     printProgramHeaders(ELFObj);
 
   // Big-endian 32-bit
-  if (const ELFObjectFile<ELFType<support::big, 4, false> > *ELFObj =
-          dyn_cast<ELFObjectFile<ELFType<support::big, 4, false> > >(Obj))
+  if (const ELF32BEObjectFile *ELFObj = dyn_cast<ELF32BEObjectFile>(Obj))
     printProgramHeaders(ELFObj);
 
   // Little-endian 64-bit
-  if (const ELFObjectFile<ELFType<support::little, 8, true> > *ELFObj =
-          dyn_cast<ELFObjectFile<ELFType<support::little, 8, true> > >(Obj))
+  if (const ELF64LEObjectFile *ELFObj = dyn_cast<ELF64LEObjectFile>(Obj))
     printProgramHeaders(ELFObj);
 
   // Big-endian 64-bit
-  if (const ELFObjectFile<ELFType<support::big, 8, true> > *ELFObj =
-          dyn_cast<ELFObjectFile<ELFType<support::big, 8, true> > >(Obj))
+  if (const ELF64BEObjectFile *ELFObj = dyn_cast<ELF64BEObjectFile>(Obj))
     printProgramHeaders(ELFObj);
 }