Add code size to target instruction use it as the 3rd isel sorting tie-breaker.

llvm-svn: 29193
diff --git a/llvm/lib/Target/Target.td b/llvm/lib/Target/Target.td
index 3e7665f..75d3d7b 100644
--- a/llvm/lib/Target/Target.td
+++ b/llvm/lib/Target/Target.td
@@ -147,6 +147,9 @@
   // code.
   list<Predicate> Predicates = [];
 
+  // Code size.
+  int CodeSize = 0;
+
   // Added complexity passed onto matching pattern.
   int AddedComplexity  = 0;