PPC/s390: fix AssembleTailCallGap cctest.

both arches don't support push anything to stack except registers

R=joransiu@ca.ibm.com, bjaideep@ca.ibm.com

Bug: 
Change-Id: I5682fc1634bc66c8aa28889abe5b977092b004f6
Reviewed-on: https://chromium-review.googlesource.com/598644Reviewed-by: Jaideep Bajwa <bjaideep@ca.ibm.com>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#47096}

src/compiler/s390/code-generator-s390.cc

@@ -1100,9 +1100,8 @@ void AdjustStackPointerForTailCall(
 
 void CodeGenerator::AssembleTailCallBeforeGap(Instruction* instr,
                                               int first_unused_stack_slot) {
-  CodeGenerator::PushTypeFlags flags(kImmediatePush | kScalarPush);
   ZoneVector<MoveOperands*> pushes(zone());
-  GetPushCompatibleMoves(instr, flags, &pushes);
+  GetPushCompatibleMoves(instr, kRegisterPush, &pushes);
 
   if (!pushes.empty() &&
       (LocationOperand::cast(pushes.back()->destination()).index() + 1 ==

test/cctest/compiler/test-code-generator.cc

@@ -42,12 +42,12 @@ class CodeGeneratorTester : public InitializedHandleScope {
                                  int first_unused_stack_slot,
                                  CodeGeneratorTester::PushTypeFlag push_type) {
     generator_.AssembleTailCallBeforeGap(instr, first_unused_stack_slot);
-#if defined(V8_TARGET_ARCH_ARM)
+#if defined(V8_TARGET_ARCH_ARM) || defined(V8_TARGET_ARCH_S390) || \
+    defined(V8_TARGET_ARCH_PPC)
     // Only folding register pushes is supported on ARM.
     bool supported = ((push_type & CodeGenerator::kRegisterPush) == push_type);
 #elif defined(V8_TARGET_ARCH_X64) || defined(V8_TARGET_ARCH_IA32) || \
-    defined(V8_TARGET_ARCH_X87) || defined(V8_TARGET_ARCH_S390X) ||  \
-    defined(V8_TARGET_ARCH_PPC64)
+    defined(V8_TARGET_ARCH_X87)
     bool supported = ((push_type & CodeGenerator::kScalarPush) == push_type);
 #else
     bool supported = false;