ARM: Reduce amount of code generated for LoadIC_Megamorphic....

src/arm/assembler-arm.cc

Index: src/arm/assembler-arm.cc
===================================================================
--- src/arm/assembler-arm.cc	(revision 8507)
+++ src/arm/assembler-arm.cc	(working copy)
@@ -2408,6 +2408,19 @@
 }
 
 
+int Assembler::NumRegistersInRegList(RegList list) {
+  ASSERT((list & ((1 << kNumRegisters) - 1)) == list);
+  ASSERT(static_cast<size_t>(kNumRegisters) <= sizeof(RegList) * 8);
+  int numregs = 0;
+  for (int i = 0; i < kNumRegisters; i++) {
+    if (list & (1 << i)) {
+      numregs++;
+    }
+  }
+  return numregs;
+}
+
+
 // Debugging.
 void Assembler::RecordJSReturn() {
   positions_recorder()->WriteRecordedPositions();