Allocate virtual registers in ascending order.

This is just the fallback tie-breaker ordering, the main allocation
order is still descending size.

Patch by Shamil Kurmangaleev!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153904 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/ARM/ldrd.ll b/test/CodeGen/ARM/ldrd.ll
index a588bc3..3f8fd75 100644
--- a/test/CodeGen/ARM/ldrd.ll
+++ b/test/CodeGen/ARM/ldrd.ll
@@ -44,8 +44,7 @@
 ; BASIC: str
 ; GREEDY: @f
 ; GREEDY: %bb
-; GREEDY: ldr
-; GREEDY: ldr
+; GREEDY: ldrd
 ; GREEDY: str
 define void @f(i32* nocapture %a, i32* nocapture %b, i32 %n) nounwind {
 entry: