test/tools/llvm-strings/file-filename.test

## Show that --print-file-name prints the name of the file before each line in
## the output.

RUN: echo abcd > %t
RUN: echo efg >> %t
RUN: echo hijk >> %t
RUN: llvm-strings -f %t | FileCheck %s --strict-whitespace -DFILE=%t
RUN: llvm-strings --print-file-name %t | FileCheck %s --strict-whitespace -DFILE=%t
CHECK:      [[FILE]]: abcd
CHECK-NEXT: [[FILE]]: hijk