Append PATH instead of overwrite

Author: mdtoguchi

clang/test/Driver/sycl.c

@@ -104,7 +104,7 @@
 // Test with a bad argument is expected to fail
 // RUN: not %clang -fsycl-help=foo %s 2>&1 | FileCheck %s --check-prefix=SYCL-HELP-BADARG
 // RUN: %clang -### -fsycl-help=gen %s 2>&1 | FileCheck %s --check-prefix=SYCL-HELP-GEN
-// RUN: env PATH=%t-sycl-dir %clang -### -fsycl-help=fpga %s 2>&1 | FileCheck %s --check-prefixes=SYCL-HELP-FPGA,SYCL-HELP-FPGA-OUT -DDIR=%t-sycl-dir
+// RUN: env PATH=%t-sycl-dir%{pathsep}%PATH% %clang -### -fsycl-help=fpga %s 2>&1 | FileCheck %s --check-prefixes=SYCL-HELP-FPGA,SYCL-HELP-FPGA-OUT -DDIR=%t-sycl-dir
 // RUN: %clang -### -fsycl-help=x86_64 %s 2>&1 | FileCheck %s --check-prefix=SYCL-HELP-CPU
 // RUN: %clang -### -fsycl-help %s 2>&1 | FileCheck %s --check-prefixes=SYCL-HELP-GEN,SYCL-HELP-FPGA,SYCL-HELP-CPU
 // SYCL-HELP-BADARG: unsupported argument 'foo' to option '-fsycl-help='