API change Path::isSpecialFile to Path::isRegularFile, improve semantics in regards to comments from 89765 post review.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89848 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Win32/Path.inc b/lib/System/Win32/Path.inc
index 9adeca2..634fbc7 100644
--- a/lib/System/Win32/Path.inc
+++ b/lib/System/Win32/Path.inc
@@ -358,8 +358,10 @@
 }
 
 bool
-Path::isSpecialFile() const {
-  return false;
+Path::isRegularFile() const {
+  if (isDirectory())
+    return false;
+  return true;
 }
 
 std::string