[deoptimizer] Fill the single precision registers in the deoptimizer entry stub.

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);
+
+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];
+  // Side effect to force the deopt after the store.
+  f32[0] = f1 - 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;
+}
+
+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"));