message: Add type to FileSpec::PathSyntax enum.
  Summary:
  Add type to FileSpec::PathSyntax enum to decrease size for
  FileSpec on systems with 32 bit pointers.
  Thanks to for pointing this out.
diff: @@ -61,7 +61,7 @@ namespace lldb_private {
  //----------------------------------------------------------------------
  class FileSpec {
  public:
  - enum PathSyntax {
  + enum PathSyntax : unsigned char {
  ePathSyntaxPosix,
  ePathSyntaxWindows,
  ePathSyntaxHostNative
  