Add -expand-relocs to llvm-readobj

This option expands shown relocations from single line to a dictionary
format:

  Relocation {
    Offset: 0x4
    Type: R_386_32 (1)
    Symbol: sym
    Info: 0x0
  }

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179359 91177308-0d34-0410-b5e6-96231b3b80d8

tools/llvm-readobj/llvm-readobj.cpp

@@ -120,6 +120,10 @@ namespace opts {
   // -needed-libs
   cl::opt<bool> NeededLibraries("needed-libs",
     cl::desc("Display the needed libraries"));
+
+  // -expand-relocs
+  cl::opt<bool> ExpandRelocs("expand-relocs",
+    cl::desc("Expand each shown relocation to multiple lines"));
 } // namespace opts
 
 namespace llvm {