Stop yield from filtering predicate for now (350809, r=igor).

js/src/js.msg

@@ -296,3 +296,4 @@ MSG_DEF(JSMSG_KEYWORD_NOT_NS,         213, 0, JSEXN_SYNTAXERR, "keyword is used
 MSG_DEF(JSMSG_BAD_GENERATOR_YIELD,    214, 1, JSEXN_TYPEERR, "yield from closing generator {0}")
 MSG_DEF(JSMSG_BAD_YIELD_SYNTAX,       215, 0, JSEXN_SYNTAXERR, "yield expression must be parenthesized")
 MSG_DEF(JSMSG_ARRAY_COMP_LEFTSIDE,    216, 0, JSEXN_SYNTAXERR, "invalid array comprehension left-hand side")
+MSG_DEF(JSMSG_YIELD_FROM_FILTER,      217, 0, JSEXN_INTERNALERR, "yield not yet supported from filtering predicate")

js/src/jsinterp.c

@@ -6106,6 +6106,13 @@ interrupt:
 
           BEGIN_CASE(JSOP_YIELD)
             ASSERT_NOT_THROWING(cx);
+            if (fp->flags & JSFRAME_FILTERING) {
+                /* FIXME: bug 309894 -- fix to eliminate this error. */
+                JS_ReportErrorNumberUC(cx, js_GetErrorMessage, NULL,
+                                       JSMSG_YIELD_FROM_FILTER);
+                ok = JS_FALSE;
+                goto out;
+            }
             if (FRAME_TO_GENERATOR(fp)->state == JSGEN_CLOSING) {
                 str = js_DecompileValueGenerator(cx, JSDVG_SEARCH_STACK,
                                                  fp->argv[-2], NULL);