Don't call FastNewFunctionContextStub if context is bigger than kMaxRegularHeapObjectSize.

src/crankshaft/arm64/lithium-codegen-arm64.cc

Index: src/crankshaft/arm64/lithium-codegen-arm64.cc
diff --git a/src/crankshaft/arm64/lithium-codegen-arm64.cc b/src/crankshaft/arm64/lithium-codegen-arm64.cc
index a5478df1c984b67611fc6f597919a57ba24a1607..b07dc256f50446611b1f41c4836f7a3a49528d2b 100644
--- a/src/crankshaft/arm64/lithium-codegen-arm64.cc
+++ b/src/crankshaft/arm64/lithium-codegen-arm64.cc
@@ -595,11 +595,16 @@ void LCodeGen::DoPrologue(LPrologue* instr) {
       __ CallRuntime(Runtime::kNewScriptContext);
       deopt_mode = Safepoint::kLazyDeopt;
     } else {
-      FastNewFunctionContextStub stub(isolate());
-      __ Mov(FastNewFunctionContextDescriptor::SlotsRegister(), slots);
-      __ CallStub(&stub);
-      // Result of FastNewFunctionContextStub is always in new space.
-      need_write_barrier = false;
+      if (slots <= FastNewFunctionContextStub::kMaximumSlots) {
+        FastNewFunctionContextStub stub(isolate());
+        __ Mov(FastNewFunctionContextDescriptor::SlotsRegister(), slots);
+        __ CallStub(&stub);
+        // Result of FastNewFunctionContextStub is always in new space.
+        need_write_barrier = false;
+      } else {
+        __ Push(x1);
+        __ CallRuntime(Runtime::kNewFunctionContext);
+      }
     }
     RecordSafepoint(deopt_mode);
     // Context is returned in x0. It replaces the context passed to us. It's