Lit: Use proper Windows paths for easier copy/paste.

interpreter/cling/test/lit.cfg

@@ -9,6 +9,14 @@ import re
 import lit.util
 import lit.formats
 
+if platform.system() == 'Windows':
+  # Use real Windows path separators so if a test fails, one can copy/paste cmds
+  def fixupPath(path):
+    return os.path.normpath(path)
+else:
+  def fixupPath(path):
+    return path
+
 # name: The name of this test suite.
 config.name = 'Cling'
 # Tweak PATH for Win32
@@ -205,7 +213,7 @@ for pattern in [r"\bbugpoint\b(?!-)",   r"(?<!/)\bclang\b(?!-)",
         if os.path.exists(substitution_ext):
              substitution = substitution_ext
              break
-    config.substitutions.append((pattern, substitution))
+    config.substitutions.append((pattern, fixupPath(substitution)))
 
 excludes = []
 
@@ -237,7 +245,7 @@ def inferCling(PATH):
 if lit_config.useValgrind:
     config.target_triple += '-vg'
 
-config.cling = inferCling(getattr(config, 'llvm_tools_dir', None)).replace('\\', '/')
+config.cling = fixupPath(inferCling(getattr(config, 'llvm_tools_dir', None)))
 if not lit_config.quiet:
     lit_config.note('using cling: %r' % config.cling)
 
@@ -247,7 +255,7 @@ if not os.getenv('CLING'):
   # Add a substitution for the builds generated include dir before install
   incDir = os.path.join(config.llvm_obj_root, 'tools', 'clang', 'include')
   config.substitutions.append( ('%built_cling', config.cling + ' --nologo -I%s'
-                                                   % os.path.normpath(incDir)) )
+                                                   % fixupPath(incDir)) )
   if not lit_config.quiet:
     lit_config.note('Running tests from build tree')
 else: