Fixed crashes exposed though fuzzing.

test/mjsunit/regress/regress-320948.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
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 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --harmony-iteration --harmony-scoping
+// Flags: --allow-natives-syntax --debug-code
 
-// Test for-of syntax.
+var one_byte = %NewString(10, true);
+var two_byte = %NewString(10, false);
 
-"use strict";
+function foo1(s, arg1, arg2) {
+  return %_OneByteSeqStringSetChar(s, arg1, arg2)
+}
+foo1(one_byte, 0, 0);
+assertThrows("{ foo1(4, 0, 0); }");
+assertThrows("{ foo1(one_byte, new Object(), 0); }");
+assertThrows("{ foo1(one_byte, 0, new Object()); }");
+assertThrows("{ foo1(one_byte, 100000, 100; }");
+assertThrows("{ foo1(one_byte, -1, 100; }");
 
-function f() { for (x of y) { } }
-function f() { for (var x of y) { } }
-function f() { for (let x of y) { } }
+function bar1(s, arg1, arg2) {
+  return %_OneByteSeqStringSetChar(s, arg1, arg2)
+}
 
-assertThrows("function f() { for (x of) { } }", SyntaxError);
-assertThrows("function f() { for (x of y z) { } }", SyntaxError);
-assertThrows("function f() { for (x of y;) { } }", SyntaxError);
+bar1(one_byte, 0, 0);
+bar1(one_byte, 0, 0);
+bar1(one_byte, 0, 0);
+%OptimizeFunctionOnNextCall(bar1);
+bar1(one_byte, 0, 0);
+assertThrows("{ bar1(4, 0, 0); }");
+assertThrows("{ bar1(one_byte, new Object(), 0); }");
+assertThrows("{ bar1(one_byte, 0, new Object()); }");
+assertThrows("{ bar1(one_byte, 100000, 100; }");
+assertThrows("{ bar1(one_byte, -1, 100; }");
 
-assertThrows("function f() { for (var x of) { } }", SyntaxError);
-assertThrows("function f() { for (var x of y z) { } }", SyntaxError);
-assertThrows("function f() { for (var x of y;) { } }", SyntaxError);
+function foo2(s, arg1, arg2) {
+  return %_TwoByteSeqStringSetChar(s, arg1, arg2)
+}
+foo2(two_byte, 0, 0);
+assertThrows("{ foo2(4, 0, 0); }");
+assertThrows("{ foo2(two_byte, new Object(), 0); }");
+assertThrows("{ foo2(two_byte, 0, new Object()); }");
+assertThrows("{ foo2(two_byte, 100000, 100; }");
+assertThrows("{ foo2(two_byte, -1, 100; }");
 
-assertThrows("function f() { for (let x of) { } }", SyntaxError);
-assertThrows("function f() { for (let x of y z) { } }", SyntaxError);
-assertThrows("function f() { for (let x of y;) { } }", SyntaxError);
+function bar2(s, arg1, arg2) {
+  return %_TwoByteSeqStringSetChar(s, arg1, arg2)
+}
 
-assertThrows("function f() { for (of y) { } }", SyntaxError);
-assertThrows("function f() { for (of of) { } }", SyntaxError);
-assertThrows("function f() { for (var of y) { } }", SyntaxError);
-assertThrows("function f() { for (var of of) { } }", SyntaxError);
-assertThrows("function f() { for (let of y) { } }", SyntaxError);
-assertThrows("function f() { for (let of of) { } }", SyntaxError);
-
-assertThrows("function f() { for (x = 3 of y) { } }", SyntaxError);
-assertThrows("function f() { for (var x = 3 of y) { } }", SyntaxError);
-assertThrows("function f() { for (let x = 3 of y) { } }", SyntaxError);
-
-
-// Alack, this appears to be valid.
-function f() { for (of of y) { } }
-function f() { for (let of of y) { } }
-function f() { for (var of of y) { } }
-
-// This too, of course.
-function f() { for (of in y) { } }
-function f() { for (var of in y) { } }
-function f() { for (let of in y) { } }
+bar2(two_byte, 0, 0);
+bar2(two_byte, 0, 0);
+bar2(two_byte, 0, 0);
+%OptimizeFunctionOnNextCall(bar2);
+bar2(two_byte, 0, 0);
+assertThrows("{ bar2(4, 0, 0); }");
+assertThrows("{ bar2(two_byte, new Object(), 0); }");
+assertThrows("{ bar2(two_byte, 0, new Object()); }");
+assertThrows("{ bar2(two_byte, 100000, 100; }");
+assertThrows("{ bar2(two_byte, -1, 100; }");