Fix regex in test case so that it doesn't match "coverage" in directory

names

The test case was failing because "-f{{[^"]*coverage.*}}" was matching
the following string:

"-fdebug-compilation-dir=/Users/buildslave/jenkins/workspace/coverage/"

Differential Revision: https://reviews.llvm.org/D152485

clang/test/Driver/cuda-no-pgo-or-coverage.cu

@@ -26,7 +26,7 @@
 // CHECK-NOT: error: unsupported option '-fprofile
 // CHECK-NOT: error: invalid argument
 // CHECK-DAG: "-fcuda-is-device"
-// CHECK-NOT: "-f{{[^"]*coverage.*}}"
+// CHECK-NOT: "-f{{[^"/]*coverage.*}}"
 // CHECK-NOT: "-fprofile{{[^"]*}}"
 // CHECK: "-triple" "x86_64-unknown-linux-gnu"
 // PROF:      "-fprofile{{.*}}"