[NFC][llvm-objcopy] Cleanup namespace usage in llvm-objcopy.

Nest any classes not used outside of a file into anon. Nest any classes used
across files in llvm-objcopy into namespace llvm::objcopy.


Differential Revision: https://reviews.llvm.org/D49449

llvm-svn: 337337
diff --git a/llvm/tools/llvm-objcopy/Object.cpp b/llvm/tools/llvm-objcopy/Object.cpp
index 1398827..7e88f52 100644
--- a/llvm/tools/llvm-objcopy/Object.cpp
+++ b/llvm/tools/llvm-objcopy/Object.cpp
@@ -27,6 +27,7 @@
 #include <vector>
 
 using namespace llvm;
+using namespace llvm::objcopy;
 using namespace object;
 using namespace ELF;
 
@@ -1387,6 +1388,7 @@
 }
 
 namespace llvm {
+namespace objcopy {
 
 template class ELFBuilder<ELF64LE>;
 template class ELFBuilder<ELF64BE>;
@@ -1397,4 +1399,5 @@
 template class ELFWriter<ELF64BE>;
 template class ELFWriter<ELF32LE>;
 template class ELFWriter<ELF32BE>;
+} // end namespace objcopy
 } // end namespace llvm