Test the exact archive format. In particular, test which file names use the
string table or not.

RUN: mkdir -p %t
RUN: cd %t

RUN: echo -n bar. > 0123456789abcde
RUN: echo -n zed. > 0123456789abcdef

RUN: rm -f %t.a
RUN: llvm-ar --format=gnu rc %t.a 0123456789abcde 0123456789abcdef
RUN: cat %t.a | FileCheck -strict-whitespace %s

CHECK:      !<arch>
CHECK-NEXT: //                                              18        `
CHECK-NEXT: 0123456789abcdef/
CHECK-NEXT: 0123456789abcde/0           0     0     644     4         `
CHECK-NEXT: bar./0              0           0     0     644     4         `
CHECK-NEXT: zed.

RUN: rm -f %t.a
RUN: llvm-ar --format=bsd rc %t.a 0123456789abcde 0123456789abcdef
RUN: cat %t.a | FileCheck -strict-whitespace --check-prefix=BSD %s

BSD:      !<arch>
BSD-NEXT: #1/20           0           0     0     644     24        `
BSD-NEXT: 0123456789abcde{{.....}}bar.
BSD-SAME: #1/16           0           0     0     644     20        `
BSD-NEXT: 0123456789abcdefzed.