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/select.ll b/test/CodeGen/ARM/select.ll
index f1bd7ee..3e07da8 100644
--- a/test/CodeGen/ARM/select.ll
+++ b/test/CodeGen/ARM/select.ll
@@ -76,12 +76,12 @@
 ; block generated, odds are good that we have close to the ideal code for this:
 ;
 ; CHECK-NEON:      _f8:
-; CHECK-NEON:      adr     r2, LCPI7_0
-; CHECK-NEON-NEXT: movw    r3, #1123
-; CHECK-NEON-NEXT: adds    r1, r2, #4
-; CHECK-NEON-NEXT: cmp     r0, r3
+; CHECK-NEON:      adr     [[R2:r[0-9]+]], LCPI7_0
+; CHECK-NEON-NEXT: movw    [[R3:r[0-9]+]], #1123
+; CHECK-NEON-NEXT: adds    {{r.*}}, [[R2]], #4
+; CHECK-NEON-NEXT: cmp     r0, [[R3]]
 ; CHECK-NEON-NEXT: it      ne
-; CHECK-NEON-NEXT: movne   r1, r2
+; CHECK-NEON-NEXT: movne   {{r.*}}, [[R2]]
 ; CHECK-NEON-NEXT: ldr
 ; CHECK-NEON:      bx