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-2565.js b/test/mjsunit/regress/regress-seqstrsetchar-ex2.js
similarity index 89%
copy from test/mjsunit/regress/regress-2565.js
copy to test/mjsunit/regress/regress-seqstrsetchar-ex2.js
index a77806a62e2209d355fce393b98797f1d20f40f8..454fdbc424f014e67ef3995a37cc5fb81f10adc2 100644
--- a/test/mjsunit/regress/regress-2565.js
+++ b/test/mjsunit/regress/regress-seqstrsetchar-ex2.js
@@ -25,8 +25,8 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-Object.freeze(Object.prototype);
-var p = {};
-var o = Object.create(p);
-assertSame(p, o.__proto__);
-assertSame(p, Object.getPrototypeOf(o));
+String.fromCharCode(0xFFF, 0xFFF);
+String.fromCharCode(0x7C, 0x7C);
+%OptimizeFunctionOnNextCall(String.fromCharCode)
+String.fromCharCode(0x7C, 0x7C);
+String.fromCharCode(0xFFF, 0xFFF);