llvm-dwarfdump: Do not include address offsets for attributes, only for tags

This reduces the noise in diffs making it more likely that, at least for
LLVM revision-over-revision, diffs will actually yield usable results.

This is consistent with objdump's DWARF dumping behavior.

llvm-svn: 188650
diff --git a/llvm/test/DebugInfo/X86/objc-fwd-decl.ll b/llvm/test/DebugInfo/X86/objc-fwd-decl.ll
index 3070ff8..666904f 100644
--- a/llvm/test/DebugInfo/X86/objc-fwd-decl.ll
+++ b/llvm/test/DebugInfo/X86/objc-fwd-decl.ll
@@ -2,8 +2,8 @@
 ; RUN: llvm-dwarfdump -debug-dump=info %t | FileCheck %s
 
 ; CHECK: 0x00000027:   DW_TAG_structure_type
-; CHECK: 0x0000002c:     DW_AT_declaration
-; CHECK: 0x0000002d:     DW_AT_APPLE_runtime_class
+; CHECK:                 DW_AT_declaration
+; CHECK:                 DW_AT_APPLE_runtime_class
 
 %0 = type opaque