[flang][nfc] Add missing `REQUIRES` flag in a test

D129156 has caused a buildbot failure:
  * https://lab.llvm.org/buildbot/#/builders/175/builds/20472.
Clearly `examples` is missing from the `REQUIRES` list. Sending this
without a review as a quick fix.

diff --git a/flang/test/Driver/pass-plugin.f90 b/flang/test/Driver/pass-plugin.f90
index 546bd92..ed3a3e2 100644 (file)
--- a/flang/test/Driver/pass-plugin.f90
+++ b/flang/test/Driver/pass-plugin.f90
@@ -2,7 +2,7 @@
 
 ! UNSUPPORTED: system-windows
 
-! REQUIRES: plugins, shell
+! REQUIRES: plugins, shell, examples
 
 ! RUN: %flang -S %s -fpass-plugin=%llvmshlibdir/Bye%pluginext -Xflang -fdebug-pass-manager -o /dev/null 2>&1 | FileCheck %s
 ! RUN: %flang_fc1 -S %s -fpass-plugin=%llvmshlibdir/Bye%pluginext -fdebug-pass-manager -o /dev/null 2>&1 | FileCheck %s