S390: Fix LA overflow in return sequence

src/s390/macro-assembler-s390.cc

 // Copyright 2014 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 <assert.h>  // For assert
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_S390
 
 #include "src/base/bits.h"
@@ skipping 136 matching lines @@
   int expected_size = CallSize(code, rmode, ast_id, cond);
   Label start;
   bind(&start);
 #endif
   call(code, rmode, ast_id);
   DCHECK_EQ(expected_size, SizeOfCodeGeneratedSince(&start));
 }
 
 void MacroAssembler::Drop(int count) {
   if (count > 0) {
-    la(sp, MemOperand(sp, count * kPointerSize));
+    int total = count * kPointerSize;
+    if (is_uint12(total)) {
+      la(sp, MemOperand(sp, total));
+    } else if (is_int20(total)) {
+      lay(sp, MemOperand(sp, total));
+    } else {
+      AddP(sp, Operand(total));
+    }
   }
 }
 
 void MacroAssembler::Drop(Register count, Register scratch) {
   ShiftLeftP(scratch, count, Operand(kPointerSizeLog2));
   AddP(sp, sp, scratch);
 }
 
 void MacroAssembler::Call(Label* target) { b(r14, target); }
 
@@ skipping 5229 matching lines @@
   }
   if (mag.shift > 0) ShiftRightArith(result, result, Operand(mag.shift));
   ExtractBit(r0, dividend, 31);
   AddP(result, r0);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_S390