PPC/s390: [builtins]: Uniformly push argument count in TF-generated builtins

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

Index: src/compiler/s390/code-generator-s390.cc
diff --git a/src/compiler/s390/code-generator-s390.cc b/src/compiler/s390/code-generator-s390.cc
index 3c2868c14e0f37fff558746310f10e2afbd070c2..e8915eafb493e67d4be492d7efae42fed7c34303 100644
--- a/src/compiler/s390/code-generator-s390.cc
+++ b/src/compiler/s390/code-generator-s390.cc
@@ -2256,6 +2256,9 @@ void CodeGenerator::AssembleConstructFrame() {
       __ LoadRR(fp, sp);
     } else if (descriptor->IsJSFunctionCall()) {
       __ Prologue(this->info()->GeneratePreagedPrologue(), ip);
+      if (descriptor->PushArgumentCount()) {
+        __ Push(kJavaScriptCallArgCountRegister);
+      }
     } else {
       StackFrame::Type type = info()->GetOutputStackFrameType();
       // TODO(mbrandy): Detect cases where ip is the entrypoint (for
@@ -2264,7 +2267,8 @@ void CodeGenerator::AssembleConstructFrame() {
     }
   }
 
-  int shrink_slots = frame()->GetSpillSlotCount();
+  int shrink_slots =
+      frame()->GetTotalFrameSlotCount() - descriptor->CalculateFixedFrameSize();
   if (info()->is_osr()) {
     // TurboFan OSR-compiled functions cannot be entered directly.
     __ Abort(kShouldNotDirectlyEnterOsrFunction);