Test that darwin archives are created with distinct (name,timestamp) pairs.

The two members with the duplicated name "test.o" must have unique
non-zero timestamps, while baz.o, being unique, remains a zero
timestamp.

RUN: mkdir -p %T/sub1
RUN: printf test > %T/test.o
RUN: printf sub1/test > %T/sub1/test.o
RUN: printf baz > %T/baz.o

RUN: rm -f %t.a
RUN: llvm-ar --format=darwin rcs %t.a %T/sub1/test.o %T/test.o %T/baz.o
RUN: FileCheck -strict-whitespace %s < %t.a

CHECK:#1/12           1           0     0     644     28        `
CHECK-NEXT:test.o
CHECK:#1/12           2           0     0     644     20        `
CHECK-NEXT:test.o
CHECK:#1/12           0           0     0     644     20        `
CHECK-NEXT:baz.o