Add r186216 back, but make the test tolerant of different uids and gids.

original message:
Fix a off by one error about which members need to use the string table.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186238 91177308-0d34-0410-b5e6-96231b3b80d8

test/Object/archive-format.test

@@ -0,0 +1,22 @@
+Test the exact archive format. In particular, test which file names use the
+string table or not.
+
+REQUIRES: shell
+
+RUN: mkdir -p %t
+RUN: cd %t
+
+RUN: echo bar > 0123456789abcde
+RUN: echo zed > 0123456789abcdef
+
+RUN: rm -f test.a
+RUN: llvm-ar rc test.a 0123456789abcde 0123456789abcdef
+RUN: cat test.a | FileCheck -strict-whitespace %s
+
+CHECK:      !<arch>
+CHECK-NEXT: //                                              18        `
+CHECK-NEXT: 0123456789abcdef/
+CHECK-NEXT: 0123456789abcde/{{.*}}  {{.*}}  {{.*}}  {{.*}}  4         `
+CHECK-NEXT: bar
+CHECK-NEXT: /0              {{.*}}  {{.*}}  {{.*}}  {{.*}}  4         `
+CHECK-NEXT: zed