fix diagnostic; add error test

Author: frasercrmck

clang/include/clang/Basic/DiagnosticDriverKinds.td

@@ -394,8 +394,7 @@ def warn_drv_fraw_string_literals_in_cxx11 : Warning<
   "ignoring '-f%select{no-|}0raw-string-literals', which is only valid for C and C++ standards before C++11">,
   InGroup<UnusedCommandLineArgument>;
 
-def err_drv_libclc_not_found : Error<
-  "no libclc library '%0' found in the clang resource directory or in LIBRARY_PATH">;
+def err_drv_libclc_not_found : Error<"no libclc library '%0' found in the clang resource directory">;
 
 def err_drv_invalid_malign_branch_EQ : Error<
   "invalid argument '%0' to -malign-branch=; each element must be one of: %1">;

clang/test/Driver/opencl-libclc.cl

@@ -1,5 +1,9 @@
 // RUN: %clang -### -target amdgcn-amd-amdhsa --no-offloadlib --libclc-lib=:%S/Inputs/libclc/libclc.bc %s 2>&1 | FileCheck %s
 // RUN: %clang -### -target amdgcn-amd-amdhsa --no-offloadlib --libclc-lib=:%S/Inputs/libclc/subdir/libclc.bc %s 2>&1 | FileCheck %s --check-prefix CHECK-SUBDIR
 
+// RUN: not %clang -### -target amdgcn-amd-amdhsa --no-offloadlib --libclc-lib=:%S/Inputs/libclc/subdir/not-here.bc %s 2>&1 | FileCheck %s --check-prefix CHECK-ERROR
+
 // CHECK: -mlink-builtin-bitcode{{.*}}Inputs{{/|\\\\}}libclc{{/|\\\\}}libclc.bc
 // CHECK-SUBDIR: -mlink-builtin-bitcode{{.*}}Inputs{{/|\\\\}}libclc{{/|\\\\}}subdir{{/|\\\\}}libclc.bc
+
+// CHECK-ERROR: no libclc library{{.*}}not-here.bc' found in the clang resource directory