BigInt: some fixes listed in #1461 (#1485)

test/built-ins/TypedArray/prototype/fill/BigInt/fill-values-conversion-once.js
- Should refer to BigInt conversion instead of ToNumber

test/built-ins/TypedArray/prototype/fill/BigInt/fill-values-non-numeric.js
- Missing coverage for non-convertable values like undefined or null?
- added fill-values-non-numeric-throw.js

test/built-ins/TypedArray/prototype/set/BigInt/array-arg-return-abrupt-tointeger-offset-symbol.js
- Change [1] to [1n] to avoid possible false-positives because ToBigInt(1) also throws a TypeError.
- Issue also present in other set() tests.

test/built-ins/TypedArray/prototype/fill/BigInt/fill-values-conversion-once.js

@@ -8,7 +8,8 @@ info: |
   22.2.3.8 %TypedArray%.prototype.fill (value [ , start [ , end ] ] )
 
   ...
-  3. Let _value_ be ? ToNumber(_value_).
+  3. If O.[[TypedArrayName]] is "BigUint64Array" or "BigInt64Array",
+     let value be ? ToBigInt(value).
   ...
 includes: [testBigIntTypedArray.js]
 features: [BigInt, TypedArray]
@@ -20,7 +21,7 @@ testWithBigIntTypedArrayConstructors(function(TA) {
   var n = 1n;
   sample.fill({ valueOf() { return n++; } });
 
-  assert.sameValue(n, 2n, "additional unexpected ToNumber() calls");
+  assert.sameValue(n, 2n, "additional unexpected ToBigInt() calls");
   assert.sameValue(sample[0], 1n, "incorrect ToNumber result in index 0");
   assert.sameValue(sample[1], 1n, "incorrect ToNumber result in index 1");
 });

test/built-ins/TypedArray/prototype/fill/BigInt/fill-values-non-numeric-throw.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-%typedarray%.prototype.fill
+description: >
+  Fills all the elements with non numeric values values.
+info: |
+  22.2.3.8 %TypedArray%.prototype.fill (value [ , start [ , end ] ] )
+
+  %TypedArray%.prototype.fill is a distinct function that implements the same
+  algorithm as Array.prototype.fill as defined in 22.1.3.6 except that the this
+  object's [[ArrayLength]] internal slot is accessed in place of performing a
+  [[Get]] of "length". The implementation of the algorithm may be optimized with
+  the knowledge that the this value is an object that has a fixed length and
+  whose integer indexed properties are not sparse. However, such optimization
+  must not introduce any observable changes in the specified behaviour of the
+  algorithm.
+
+  ...
+
+  22.1.3.6 Array.prototype.fill (value [ , start [ , end ] ] )
+
+  ...
+  7. Repeat, while k < final
+    a. Let Pk be ! ToString(k).
+    b. Perform ? Set(O, Pk, value, true).
+  ...
+
+  9.4.5.9 IntegerIndexedElementSet ( O, index, value )
+
+  ...
+  5. If arrayTypeName is "BigUint64Array" or "BigInt64Array",
+     let numValue be ? ToBigInt(value).
+  ...
+
+includes: [testBigIntTypedArray.js]
+features: [BigInt, TypedArray]
+---*/
+
+testWithBigIntTypedArrayConstructors(function(TA) {
+  var sample;
+
+  sample = new TA([42n]);
+
+  assert.throws(TypeError, function() {
+    sample.fill(undefined);
+  }, "abrupt completion from undefined");
+
+  assert.throws(TypeError, function() {
+    sample.fill(null);
+  }, "abrupt completion from null");
+
+  assert.throws(SyntaxError, function() {
+    sample.fill("nonsense");
+  }, "abrupt completion from string");
+
+});

test/built-ins/TypedArray/prototype/fill/BigInt/fill-values-non-numeric.js

@@ -29,7 +29,8 @@ info: |
   9.4.5.9 IntegerIndexedElementSet ( O, index, value )
 
   ...
-  3. Let numValue be ? ToNumber(value).
+  5. If arrayTypeName is "BigUint64Array" or "BigInt64Array",
+     let numValue be ? ToBigInt(value).
   ...
 
 includes: [testBigIntTypedArray.js]
@@ -69,4 +70,5 @@ testWithBigIntTypedArrayConstructors(function(TA) {
     }
   });
   assert.sameValue(sample[0], 7n, "object toString when valueOf is absent");
+
 });

test/built-ins/TypedArray/prototype/set/BigInt/array-arg-negative-integer-offset-throws.js

@@ -22,14 +22,14 @@ testWithBigIntTypedArrayConstructors(function(TA) {
   var sample = new TA(4);
 
   assert.throws(RangeError, function() {
-    sample.set([1], -1);
+    sample.set([1n], -1);
   }, "-1");
 
   assert.throws(RangeError, function() {
-    sample.set([1], -1.00001);
+    sample.set([1n], -1.00001);
   }, "-1.00001");
 
   assert.throws(RangeError, function() {
-    sample.set([1], -Infinity);
+    sample.set([1n], -Infinity);
   }, "-Infinity");
 });

test/built-ins/TypedArray/prototype/set/BigInt/array-arg-return-abrupt-from-tointeger-offset-symbol.js

@@ -22,6 +22,6 @@ testWithBigIntTypedArrayConstructors(function(TA) {
   var sample = new TA(2);
 
   assert.throws(TypeError, function() {
-    sample.set([1], s);
+    sample.set([1n], s);
   });
 });

test/built-ins/TypedArray/prototype/set/BigInt/array-arg-targetbuffer-detached-on-tointeger-offset-throws.js

@@ -32,7 +32,7 @@ testWithBigIntTypedArrayConstructors(function(TA) {
   };
 
   assert.throws(TypeError, function() {
-    sample.set([1], obj);
+    sample.set([1n], obj);
   });
 
   assert.sameValue(calledOffset, 1);

test/built-ins/TypedArray/prototype/set/BigInt/array-arg-targetbuffer-detached-throws.js

@@ -34,7 +34,7 @@ testWithBigIntTypedArrayConstructors(function(TA) {
   $DETACHBUFFER(sample.buffer);
 
   assert.throws(TypeError, function() {
-    sample.set([1]);
+    sample.set([1n]);
   }, "regular check");
 
   assert.throws(TypeError, function() {