[llvm-readobj] Dump MachO Dysymtab command.

Example output:

File: <stdin>
Format: Mach-O 64-bit x86-64
Arch: x86_64
AddressSize: 64bit
Dysymtab {

ilocalsym: 0
nlocalsym: 6
iextdefsym: 6
nextdefsym: 2
iundefsym: 8
nundefsym: 0
tocoff: 0
ntoc: 0
modtaboff: 0
nmodtab: 0
extrefsymoff: 0
nextrefsyms: 0
indirectsymoff: 0
nindirectsyms: 0
extreloff: 0
nextrel: 0
locreloff: 0
nlocrel: 0

}

Differential Revision:	http://reviews.llvm.org/D12496

llvm-svn: 246474

llvm/tools/llvm-readobj/llvm-readobj.cpp

@@ -191,6 +191,12 @@ namespace opts {
   cl::opt<bool>
   MachOVersionMin("macho-version-min",
                   cl::desc("Display MachO version min command"));
+
+  // -macho-dysymtab
+  cl::opt<bool>
+  MachODysymtab("macho-dysymtab",
+                  cl::desc("Display MachO Dysymtab command"));
+
   // -stackmap
   cl::opt<bool>
   PrintStackMap("stackmap",
@@ -327,6 +333,8 @@ static void dumpObject(const ObjectFile *Obj) {
       Dumper->printMachODataInCode();
     if (opts::MachOVersionMin)
       Dumper->printMachOVersionMin();
+    if (opts::MachODysymtab)
+      Dumper->printMachODysymtab();
   }
   if (opts::PrintStackMap)
     Dumper->printStackMap();