Fix code gen bug on arm and mips; SeqStringSetChar overwrites a register; Add better default PrintD…

test/mjsunit/regress/regress-seqstrsetchar-ex2.js

Index: test/mjsunit/regress/regress-seqstrsetchar-ex2.js
diff --git a/test/mjsunit/regress/regress-2671-1.js b/test/mjsunit/regress/regress-seqstrsetchar-ex2.js
similarity index 89%
copy from test/mjsunit/regress/regress-2671-1.js
copy to test/mjsunit/regress/regress-seqstrsetchar-ex2.js
index 042a501e5adb86cd7d868ec721edef8edde27274..6acc2f285e654f52d497fb127ae88432b9452954 100644
--- a/test/mjsunit/regress/regress-2671-1.js
+++ b/test/mjsunit/regress/regress-seqstrsetchar-ex2.js
@@ -27,19 +27,9 @@
 
 // Flags: --allow-natives-syntax
 
-var y;
-function f() {
-  var a = [];
-  a[20] = 0;
-  y = 3;
-  var i = 7 * (y + -0);
-  a[i]++;
-  assertTrue(isNaN(a[i]));
-}
-
-f();
-f();
-f();
-%OptimizeFunctionOnNextCall(f);
-f();
+String.fromCharCode(0xFFF, 0xFFF);
+String.fromCharCode(0x7C, 0x7C);
+%OptimizeFunctionOnNextCall(String.fromCharCode);
+String.fromCharCode(0x7C, 0x7C);
+String.fromCharCode(0xFFF, 0xFFF);