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

src/full-codegen/x87/full-codegen-x87.cc

Index: src/full-codegen/x87/full-codegen-x87.cc
diff --git a/src/full-codegen/x87/full-codegen-x87.cc b/src/full-codegen/x87/full-codegen-x87.cc
index e07a7e6ba894a24c5b24b384888aec1cc06d09af..ebac0b8c161e36b4d3b28d3a16686cc279bcc2e3 100644
--- a/src/full-codegen/x87/full-codegen-x87.cc
+++ b/src/full-codegen/x87/full-codegen-x87.cc
@@ -189,12 +189,17 @@ void FullCodeGenerator::Generate() {
       if (info->scope()->new_target_var() != nullptr) {
         __ push(edx);  // Preserve new target.
       }
-      FastNewFunctionContextStub stub(isolate());
-      __ mov(FastNewFunctionContextDescriptor::SlotsRegister(),
-             Immediate(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(),
+               Immediate(slots));
+        __ CallStub(&stub);
+        // Result of FastNewFunctionContextStub is always in new space.
+        need_write_barrier = false;
+      } else {
+        __ push(edi);
+        __ CallRuntime(Runtime::kNewFunctionContext);
+      }
       if (info->scope()->new_target_var() != nullptr) {
         __ pop(edx);  // Restore new target.
       }