[llvm-readobj] MachO: Dump segment command.

Example output:

File: <stdin>
Format: Mach-O arm
Arch: arm
AddressSize: 32bit
Segment {
  Cmd: LC_SEGMENT
  Name:
  Size: 260
  vmaddr: 0x0
  vmsize: 0x10
  fileoff: 408
  filesize: 408
  maxprot: rwx
  initprot: rwx
  nsects: 3
  flags: 0x0
}

Differential Revision:	 http://reviews.llvm.org/D12542

llvm-svn: 246665

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

@@ -187,6 +187,11 @@ namespace opts {
   MachODataInCode("macho-data-in-code",
                   cl::desc("Display MachO Data in Code command"));
 
+  // -macho-segment
+  cl::opt<bool>
+  MachOSegment("macho-segment",
+                  cl::desc("Display MachO Segment command"));
+
   // -macho-version-min
   cl::opt<bool>
   MachOVersionMin("macho-version-min",
@@ -331,6 +336,8 @@ static void dumpObject(const ObjectFile *Obj) {
   if (Obj->isMachO()) {
     if (opts::MachODataInCode)
       Dumper->printMachODataInCode();
+    if (opts::MachOSegment)
+      Dumper->printMachOSegment();
     if (opts::MachOVersionMin)
       Dumper->printMachOVersionMin();
     if (opts::MachODysymtab)