[deoptimizer] float32 stack on s390 and ppc is on lower 32 bit

test/mjsunit/compiler/regress-v8-6077.js

 // Copyright 2017 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.
 
 // Flags: --allow-natives-syntax
 
-var f32 = new Float32Array(20);
+var f32 = new Float32Array(40);
 
 function foo(f32, deopt) {
-  var f0 = f32[0];
-  var f1 = f32[1];
-  var f2 = f32[2];
-  var f3 = f32[3];
-  var f4 = f32[4];
-  var f5 = f32[5];
-  var f6 = f32[6];
-  var f7 = f32[7];
-  var f8 = f32[8];
-  var f9 = f32[9];
-  var f10 = f32[10];
-  var f11 = f32[11];
-  var f12 = f32[12];
-  var f13 = f32[13];
-  var f14 = f32[14];
-  var f15 = f32[15];
-  var f16 = f32[16];
-  var f17 = f32[17];
-  var f18 = f32[18];
-  var f19 = f32[19];
+  var v0 = f32[0];
+  var v1 = f32[1];
+  var v2 = f32[2];
+  var v3 = f32[3];
+  var v4 = f32[4];
+  var v5 = f32[5];
+  var v6 = f32[6];
+  var v7 = f32[7];
+  var v8 = f32[8];
+  var v9 = f32[9];
+  var v10 = f32[10];
+  var v11 = f32[11];
+  var v12 = f32[12];
+  var v13 = f32[13];
+  var v14 = f32[14];
+  var v15 = f32[15];
+  var v16 = f32[16];
+  var v17 = f32[17];
+  var v18 = f32[18];
+  var v19 = f32[19];
+  var v20 = f32[20];
+  var v21 = f32[21];
+  var v22 = f32[22];
+  var v23 = f32[23];
+  var v24 = f32[24];
+  var v25 = f32[25];
+  var v26 = f32[26];
+  var v27 = f32[27];
+  var v28 = f32[28];
+  var v29 = f32[29];
+  var v30 = f32[30];
+  var v31 = f32[31];
+  var v32 = f32[32];
+  var v33 = f32[33];
+  var v34 = f32[34];
+  var v35 = f32[35];
+  var v36 = f32[36];
+  var v37 = f32[37];
+  var v38 = f32[38];
+  var v39 = f32[39];
   // Side effect to force the deopt after the store.
-  f32[0] = f1 - 1;
+  f32[0] = v1 - 1;
   // Here we deopt once we warm up with numbers, but then we
   // pass a string as {deopt}.
-  return deopt + f0 + f1 + f2 + f3 + f4 + f5 + f6 + f7 + f8 + f9 + f10 + f11 +
-      f12 + f13 + f14 + f15 + f16 + f17 + f18 + f19;
+  return deopt + v0 + v1 + v2 + v3 + v4 + v5 + v6 + v7 + v8 + v9 + v10 + v11 +
+      v12 + v13 + v14 + v15 + v16 + v17 + v18 + v19 + v20 + v21 + v22 + v23 +
+      v24 + v25 + v26 + v27 + v28 + v29 + v30 + v31 + v32 + v33 + v34 + v35 +
+      v36 + v37 + v38 + v39;
 }
 
 var s = "";
 for (var i = 0; i < f32.length; i++) {
   f32[i] = i;
   s += i;
 }
 
 foo(f32, 0);
 foo(f32, 0);
 %OptimizeFunctionOnNextCall(foo);
 assertEquals("x" + s, foo(f32, "x"));