We have the `--check-prefixes` invocation for a single suffix.
It is cleaner to use `--check-prefix` in this case.
## Check what we print when the dynamic string table is empty.
# RUN: yaml2obj %s --docnum=2 -o %t2
# RUN: llvm-readobj --needed-libs %t2 2>&1 | \
-# RUN: FileCheck %s -DFILE=%t2 --implicit-check-not=warning: --check-prefixes=EMPTY-DYNSTR
+# RUN: FileCheck %s -DFILE=%t2 --implicit-check-not=warning: --check-prefix=EMPTY-DYNSTR
# RUN: llvm-readelf --needed-libs %t2 2>&1 | \
# RUN: FileCheck %s -DFILE=%t2 --implicit-check-not=warning: --check-prefix=EMPTY-DYNSTR