Add a CodeGenOpt::Less level to match -O1. It'll be used by clients which do not want post-regalloc scheduling.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84272 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/lli/lli.cpp b/tools/lli/lli.cpp
index e5c1070..723d6a8 100644
--- a/tools/lli/lli.cpp
+++ b/tools/lli/lli.cpp
@@ -148,7 +148,7 @@
     return 1;
   case ' ': break;
   case '0': OLvl = CodeGenOpt::None; break;
-  case '1':
+  case '1': OLvl = CodeGenOpt::Less; break;
   case '2': OLvl = CodeGenOpt::Default; break;
   case '3': OLvl = CodeGenOpt::Aggressive; break;
   }