Tests for union type literals

A union type literal is written as a sequence of types separated by vertical bars.
UnionType:
PrimaryOrUnionType   |   PrimaryType
A union typle literal references a union type.
When function or constructor types are included in union types they must be enclosed in parentheses

tests/baselines/reference/unionTypeLiterals.js

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+//// [unionTypeLiterals.ts]
+// basic valid forms of union literals
+
+var simpleUnion: string | number;
+var unionOfUnion: string | number | boolean;
+
+var arrayOfUnions: (string | number)[];
+var arrayOfUnions: Array<string | number>;
+
+var unionOfFunctionType: (() => string) | (() => number);
+var unionOfFunctionType: { (): string } | { (): number };
+var unionOfFunctionType: () => string | number;
+
+var unionOfConstructorType: (new () => string) | (new () => number);
+var unionOfConstructorType: { new (): string } | { new (): number };
+var unionOfConstructorType: new () => string | number;
+
+//// [unionTypeLiterals.js]
+// basic valid forms of union literals
+var simpleUnion;
+var unionOfUnion;
+var arrayOfUnions;
+var arrayOfUnions;
+var unionOfFunctionType;
+var unionOfFunctionType;
+var unionOfFunctionType;
+var unionOfConstructorType;
+var unionOfConstructorType;
+var unionOfConstructorType;

tests/baselines/reference/unionTypeLiterals.types

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+=== tests/cases/conformance/types/specifyingTypes/typeLiterals/unionTypeLiterals.ts ===
+// basic valid forms of union literals
+
+var simpleUnion: string | number;
+>simpleUnion : string | number
+
+var unionOfUnion: string | number | boolean;
+>unionOfUnion : string | number | boolean
+
+var arrayOfUnions: (string | number)[];
+>arrayOfUnions : (string | number)[]
+
+var arrayOfUnions: Array<string | number>;
+>arrayOfUnions : (string | number)[]
+>Array : T[]
+
+var unionOfFunctionType: (() => string) | (() => number);
+>unionOfFunctionType : (() => string) | (() => number)
+
+var unionOfFunctionType: { (): string } | { (): number };
+>unionOfFunctionType : (() => string) | (() => number)
+
+var unionOfFunctionType: () => string | number;
+>unionOfFunctionType : (() => string) | (() => number)
+
+var unionOfConstructorType: (new () => string) | (new () => number);
+>unionOfConstructorType : (new () => string) | (new () => number)
+
+var unionOfConstructorType: { new (): string } | { new (): number };
+>unionOfConstructorType : (new () => string) | (new () => number)
+
+var unionOfConstructorType: new () => string | number;
+>unionOfConstructorType : (new () => string) | (new () => number)
+

tests/cases/conformance/types/specifyingTypes/typeLiterals/unionTypeLiterals.ts

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+// basic valid forms of union literals
+
+var simpleUnion: string | number;
+var unionOfUnion: string | number | boolean;
+
+var arrayOfUnions: (string | number)[];
+var arrayOfUnions: Array<string | number>;
+
+var unionOfFunctionType: (() => string) | (() => number);
+var unionOfFunctionType: { (): string } | { (): number };
+var unionOfFunctionType: () => string | number;
+
+var unionOfConstructorType: (new () => string) | (new () => number);
+var unionOfConstructorType: { new (): string } | { new (): number };
+var unionOfConstructorType: new () => string | number;