A64: Use a scope utility to allocate scratch registers.

src/a64/ic-a64.cc

Index: src/a64/ic-a64.cc
diff --git a/src/a64/ic-a64.cc b/src/a64/ic-a64.cc
index 93d7857b050527004e4a672dac1392421796397b..73d4013a7cf8bf00787597b4cf3005782d073058 100644
--- a/src/a64/ic-a64.cc
+++ b/src/a64/ic-a64.cc
@@ -1074,6 +1074,7 @@ static void KeyedStoreGenerateGenericHelper(
                                          FAST_DOUBLE_ELEMENTS,
                                          receiver_map,
                                          x10,
+                                         x11,
                                          slow);
   ASSERT(receiver_map.Is(x3));  // Transition code expects map in x3.
   AllocationSiteMode mode = AllocationSite::GetMode(FAST_SMI_ELEMENTS,
@@ -1088,6 +1089,7 @@ static void KeyedStoreGenerateGenericHelper(
                                          FAST_ELEMENTS,
                                          receiver_map,
                                          x10,
+                                         x11,
                                          slow);
   ASSERT(receiver_map.Is(x3));  // Transition code expects map in x3.
   mode = AllocationSite::GetMode(FAST_SMI_ELEMENTS, FAST_ELEMENTS);
@@ -1104,6 +1106,7 @@ static void KeyedStoreGenerateGenericHelper(
                                          FAST_ELEMENTS,
                                          receiver_map,
                                          x10,
+                                         x11,
                                          slow);
   ASSERT(receiver_map.Is(x3));  // Transition code expects map in x3.
   mode = AllocationSite::GetMode(FAST_DOUBLE_ELEMENTS, FAST_ELEMENTS);