[llvm-readobj] Include the PE magic value in printouts

This is useful for a testcase in lld.

Differential Revision: https://reviews.llvm.org/D34836

llvm-svn: 306794
diff --git a/llvm/test/tools/llvm-readobj/file-headers.test b/llvm/test/tools/llvm-readobj/file-headers.test
index 47fb24d..5bfebf7 100644
--- a/llvm/test/tools/llvm-readobj/file-headers.test
+++ b/llvm/test/tools/llvm-readobj/file-headers.test
@@ -238,6 +238,7 @@
 PE32-NEXT:   ]
 PE32-NEXT: }
 PE32-NEXT: ImageOptionalHeader {
+PE32-NEXT:   Magic: 0x10B
 PE32-NEXT:   MajorLinkerVersion: 11
 PE32-NEXT:   MinorLinkerVersion: 0
 PE32-NEXT:   SizeOfCode: 512