Make invalid break/continue statements an early syntax error.

test/mjsunit/regress/regress-1036894.js

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-xeval = function(s) { eval(s); }
-xeval("$=function anonymous() { /*noex*/do {} while(({ get x(x) { break ; }, set x() { (undefined);} })); }");
+assertThrows("$=function anonymous() { /*noex*/do {} while(({ get x(x) { break ; }, set x() { (undefined);} })); }");
 
-foo = function() { eval("$=function anonymous() { /*noex*/do {} while(({ get x(x) { break ; }, set x() { (undefined);} })); }"); }
+function foo() {
+  assertThrows("$=function anonymous() { /*noex*/do {} while(({ get x(x) { break ; }, set x() { (undefined);} })); }");
+}
 foo();
 
-xeval = function(s) { eval(s); }
-eval("$=function anonymous() { /*noex*/do {} while(({ get x(x) { break ; }, set x() { (undefined);} })); }");
+assertThrows("$=function anonymous() { /*noex*/do {} while(({ get x(x) { break ; }, set x() { (undefined);} })); }");
 
 xeval = function(s) { eval(s); }
 xeval('$=function(){L: {break L;break L;}};');