[llvm-cov] Try to fix the native_separators.c test some more

It's still breaking this bot (though, it looks like it always had been):

  http://lab.llvm.org:8011/builders/clang-x86-windows-msvc2015

This time, add quotes around llvm-{cov,config} so that lit won't expand
them.

Thanks to Reid for suggesting the patch!

llvm-svn: 281072

Author: vedantk

llvm/test/tools/llvm-cov/native_separators.c

@@ -8,7 +8,7 @@
 // RUN: llvm-profdata merge %S/Inputs/double_dots.proftext -o %t.profdata
 // RUN: llvm-cov show %S/Inputs/native_separators.covmapping -instr-profile=%t.profdata -o %t.dir
 // RUN: FileCheck -check-prefixes=TEXT-INDEX -input-file=%t.dir/index.txt %s
-// RUN: llvm-cov show -format=html %S/Inputs/native_separators.covmapping -instr-profile=%t.profdata -filename-equivalence ../llvm-config/../llvm-cov/native_separators.c -o %t.dir
+// RUN: llvm-cov show -format=html %S/Inputs/native_separators.covmapping -instr-profile=%t.profdata -filename-equivalence ../llvm-"config"/../llvm-"cov"/native_separators.c -o %t.dir
 // RUN: FileCheck -check-prefixes=HTML-INDEX -input-file=%t.dir/index.html %s
 // RUN: llvm-cov show -format=html %S/Inputs/native_separators.covmapping -instr-profile=%t.profdata -filename-equivalence %s -o %t.dir
 // RUN: FileCheck -check-prefixes=HTML -input-file=%t.dir/coverage/tmp/native_separators.c.html %s