8340269: [s390x] TestLargeStub.java failure after 8338123

Reviewed-by: mdoerr, lucy

Author: offamitkumar

src/hotspot/cpu/s390/downcallLinker_s390.cpp

@@ -36,8 +36,8 @@
 
 #define __ _masm->
 
-static const int native_invoker_code_base_size = 512;
-static const int native_invoker_size_per_args = 8;
+static const int native_invoker_code_base_size = 384;
+static const int native_invoker_size_per_args = 12;
 
 RuntimeStub* DowncallLinker::make_downcall_stub(BasicType* signature,
                                                 int num_args,