Driver: Tweak option naming/def:
 - Use OPT_ prefix for ids.

 - Reference groups and aliases by shortend id (on the theory that
   this is more readable).

 - Rename the special option ids to more protected names.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@66767 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Option.cpp b/lib/Driver/Option.cpp
index 7a74d34..7a53009 100644
--- a/lib/Driver/Option.cpp
+++ b/lib/Driver/Option.cpp
@@ -113,7 +113,7 @@
 }
 
 InputOption::InputOption()
-  : Option(Option::InputClass, options::InputOpt, "<input>", 0, 0) {
+  : Option(Option::InputClass, options::OPT_INPUT, "<input>", 0, 0) {
 }
 
 Arg *InputOption::accept(const ArgList &Args, unsigned &Index) const {
@@ -122,7 +122,7 @@
 }
 
 UnknownOption::UnknownOption()
-  : Option(Option::UnknownClass, options::UnknownOpt, "<unknown>", 0, 0) {
+  : Option(Option::UnknownClass, options::OPT_UNKNOWN, "<unknown>", 0, 0) {
 }
 
 Arg *UnknownOption::accept(const ArgList &Args, unsigned &Index) const {