Allow more virtual registers to be encoded in LUnallocated.

src/arm/lithium-arm.cc

Index: src/arm/lithium-arm.cc
diff --git a/src/arm/lithium-arm.cc b/src/arm/lithium-arm.cc
index 7e81ca60e8cd3d4465385d0a8cdee13da80ecce2..0d84ef37bb4c3c6a3068e0259dec87448510396b 100644
--- a/src/arm/lithium-arm.cc
+++ b/src/arm/lithium-arm.cc
@@ -2453,7 +2453,7 @@ LInstruction* LChunkBuilder::DoParameter(HParameter* instr) {
 
 LInstruction* LChunkBuilder::DoUnknownOSRValue(HUnknownOSRValue* instr) {
   int spill_index = chunk()->GetNextSpillIndex(false);  // Not double-width.
-  if (spill_index > LUnallocated::kMaxFixedIndex) {
+  if (spill_index > LUnallocated::kMaxFixedSlotIndex) {
     Abort("Too many spill slots needed for OSR");
     spill_index = 0;
   }