[typedarrays] Check detached buffer at start of typed array methods

test/mjsunit/regress/regress-4665.js

Index: test/mjsunit/regress/regress-4665.js
diff --git a/test/mjsunit/regress/regress-4665.js b/test/mjsunit/regress/regress-4665.js
index a75d68f105633322f9c9c8151dcf4a093e7bbff2..9aed4ed0ce44e453e47a2d0cdc30c11ae7171f9b 100644
--- a/test/mjsunit/regress/regress-4665.js
+++ b/test/mjsunit/regress/regress-4665.js
@@ -11,12 +11,14 @@ FirstBuffer.__proto__ = Uint8Array
 var buf = new Uint8Array(10)
 buf.__proto__ = FirstBuffer.prototype
 
-var buf2 = buf.subarray(2)
-assertEquals(8, buf2.length);
+assertThrows(() => buf.subarray(2), TypeError);
 
 // Second test case
 
+let seen_args = [];
+
 function SecondBuffer (arg) {
+  seen_args.push(arg);
   var arr = new Uint8Array(arg)
   arr.__proto__ = SecondBuffer.prototype
   return arr
@@ -25,7 +27,9 @@ SecondBuffer.prototype.__proto__ = Uint8Array.prototype
 SecondBuffer.__proto__ = Uint8Array
 
 var buf3 = new SecondBuffer(10)
+assertEquals([10], seen_args);
 
 var buf4 = buf3.subarray(2)
 
-assertEquals(8, buf4.length);
+assertEquals(10, buf4.length);
+assertEquals([10, buf3.buffer], seen_args);