macho-dump: Add support for --dump-section-data and tweak a few format strings.

llvm-svn: 120219
diff --git a/llvm/lib/Object/MachOObject.cpp b/llvm/lib/Object/MachOObject.cpp
index 33890f6..1051ce2 100644
--- a/llvm/lib/Object/MachOObject.cpp
+++ b/llvm/lib/Object/MachOObject.cpp
@@ -125,6 +125,10 @@
   return Object.take();
 }
 
+StringRef MachOObject::getData(size_t Offset, size_t Size) const {
+  return Buffer->getBuffer().substr(Offset,Size);
+}
+
 void MachOObject::RegisterStringTable(macho::SymtabLoadCommand &SLC) {
   HasStringTable = true;
   StringTable = Buffer->getBuffer().substr(SLC.StringTableOffset,