s390x: [wasm] Adding r3 to GP return register list

src/compiler/wasm-linkage.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/assembler.h"
 #include "src/base/lazy-instance.h"
 #include "src/macro-assembler.h"
 #include "src/register-configuration.h"
 
 #include "src/wasm/wasm-module.h"
@@ skipping 113 matching lines @@
 #define GP_PARAM_REGISTERS r3, r4, r5, r6, r7, r8, r9, r10
 #define GP_RETURN_REGISTERS r3, r4
 #define FP_PARAM_REGISTERS d1, d2, d3, d4, d5, d6, d7, d8
 #define FP_RETURN_REGISTERS d1, d2
 
 #elif V8_TARGET_ARCH_S390X
 // ===========================================================================
 // == s390x ==================================================================
 // ===========================================================================
 #define GP_PARAM_REGISTERS r2, r3, r4, r5, r6
-#define GP_RETURN_REGISTERS r2
+#define GP_RETURN_REGISTERS r2, r3
 #define FP_PARAM_REGISTERS d0, d2, d4, d6
 #define FP_RETURN_REGISTERS d0, d2, d4, d6
 
 #elif V8_TARGET_ARCH_S390
 // ===========================================================================
 // == s390 ===================================================================
 // ===========================================================================
 #define GP_PARAM_REGISTERS r2, r3, r4, r5, r6
 #define GP_RETURN_REGISTERS r2, r3
 #define FP_PARAM_REGISTERS d0, d2
@@ skipping 224 matching lines @@
       descriptor->CalleeSavedFPRegisters(),  // callee-saved fp regs
       descriptor->flags(),                   // flags
       descriptor->debug_name());
 
   return descriptor;
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8