s390: Fix lay overflow when too many arguments on stack

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

Bug: 
Change-Id: Ia9fa7785b0f508775f38547e56f07bc7ef9ee03d
Reviewed-on: https://chromium-review.googlesource.com/557928
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Reviewed-by: Jaideep Bajwa <bjaideep@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#47055}

src/s390/macro-assembler-s390.cc

@@ -951,8 +951,13 @@ int TurboAssembler::LeaveFrame(StackFrame::Type type, int stack_adjustment) {
   // Drop the execution stack down to the frame pointer and restore
   // the caller frame pointer, return address and constant pool pointer.
   LoadP(r14, MemOperand(fp, StandardFrameConstants::kCallerPCOffset));
-  lay(r1, MemOperand(
-              fp, StandardFrameConstants::kCallerSPOffset + stack_adjustment));
+  if (is_int20(StandardFrameConstants::kCallerSPOffset + stack_adjustment)) {
+    lay(r1, MemOperand(fp, StandardFrameConstants::kCallerSPOffset +
+                               stack_adjustment));
+  } else {
+    AddP(r1, fp,
+         Operand(StandardFrameConstants::kCallerSPOffset + stack_adjustment));
+  }
   LoadP(fp, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
   LoadRR(sp, r1);
   int frame_ends = pc_offset();