Add tests for invalid BigInt MVs

test/language/literals/bigint/mv-is-not-integer-dil-dot-dds.js

+// Copyright (C) 2017 The V8 Project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-numeric-literal-static-semantics-early-errors
+description: > 
+  It is a Syntax Error if the MV is not an integer. (decimalIntegerLiteral dot decimalDigits)
+info: |
+  Static Semantics: BigInt Value
+
+  NumericLiteral :: NumericLiteralBase NumericLiteralSuffix
+
+  1. Assert: NumericLiteralSuffix is n.
+  2. Let the value of NumericLiteral be the MV of NumericLiteralBase represented as BigInt.
+
+  DecimalLiteral ::
+    DecimalIntegerLiteral . DecimalDigits_opt
+    . DecimalDigits
+features: [BigInt]
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+2017.8n;

test/language/literals/bigint/mv-is-not-integer-dot-dds.js

+// Copyright (C) 2017 The V8 Project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-numeric-literal-static-semantics-early-errors
+description: > 
+  It is a Syntax Error if the MV is not an integer. (dot decimalDigits)
+info: |
+  Static Semantics: BigInt Value
+
+  NumericLiteral :: NumericLiteralBase NumericLiteralSuffix
+
+  1. Assert: NumericLiteralSuffix is n.
+  2. Let the value of NumericLiteral be the MV of NumericLiteralBase represented as BigInt.
+
+  DecimalLiteral ::
+    DecimalIntegerLiteral . DecimalDigits_opt
+    . DecimalDigits
+features: [BigInt]
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+.0000000001n;