[clang][Hexagon] Match -lc option more specifically in toolchain test

In https://lab.llvm.org/buildbot/#/builders/185/builds/1341
our bot happened to generate a temporary file path with -lc in
it.

Match with "" around the options so this doesn't happen again.

clang/test/Driver/hexagon-toolchain-linux.c

@@ -39,8 +39,8 @@
 // CHECK002:       "-dynamic-linker={{/|\\\\}}lib{{/|\\\\}}ld-musl-hexagon.so.1"
 // CHECK002-NOT:   {{.*}}basic_linux_libcxx_tree{{/|\\\\}}usr{{/|\\\\}}lib{{/|\\\\}}crti.o
 // CHECK002-NOT:   {{.*}}basic_linux_libcxx_tree{{/|\\\\}}usr{{/|\\\\}}lib{{/|\\\\}}crt1.o
-// CHECK002-NOT:   -lclang_rt.builtins-hexagon
-// CHECK002-NOT:   -lc
+// CHECK002-NOT:   "-lclang_rt.builtins-hexagon"
+// CHECK002-NOT:   "-lc"
 // -----------------------------------------------------------------------------
 // Passing --musl -nostartfiles
 // -----------------------------------------------------------------------------
@@ -65,8 +65,8 @@
 // RUN:   | FileCheck -check-prefix=CHECK004 %s
 // CHECK004:       "-dynamic-linker={{/|\\\\}}lib{{/|\\\\}}ld-musl-hexagon.so.1"
 // CHECK004:       "{{.*}}basic_linux_libcxx_tree{{/|\\\\}}usr{{/|\\\\}}lib{{/|\\\\}}crt1.o"
-// CHECK004-NOT:   -lclang_rt.builtins-hexagon
-// CHECK004-NOT:   -lc
+// CHECK004-NOT:   "-lclang_rt.builtins-hexagon"
+// CHECK004-NOT:   "-lc"
 // -----------------------------------------------------------------------------
 // Not Passing -fno-use-init-array when musl is selected
 // -----------------------------------------------------------------------------