Adding test case for scenario in which error reported depends on order of files

tests/baselines/reference/jsFileCompilationDuplicateVariable.js

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+//// [tests/cases/compiler/jsFileCompilationDuplicateVariable.ts] ////
+
+//// [a.ts]
+var x = 10;
+
+//// [b.js]
+var x = "hello"; // No error is recorded here and declaration file will show this as number
+
+//// [out.js]
+var x = 10;
+var x = "hello"; // No error is recorded here and declaration file will show this as number
+
+
+//// [out.d.ts]
+declare var x: number;
+declare var x: number;

tests/baselines/reference/jsFileCompilationDuplicateVariable.symbols

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+=== tests/cases/compiler/a.ts ===
+var x = 10;
+>x : Symbol(x, Decl(a.ts, 0, 3), Decl(b.js, 0, 3))
+
+=== tests/cases/compiler/b.js ===
+var x = "hello"; // No error is recorded here and declaration file will show this as number
+>x : Symbol(x, Decl(a.ts, 0, 3), Decl(b.js, 0, 3))
+

tests/baselines/reference/jsFileCompilationDuplicateVariable.types

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+=== tests/cases/compiler/a.ts ===
+var x = 10;
+>x : number
+>10 : number
+
+=== tests/cases/compiler/b.js ===
+var x = "hello"; // No error is recorded here and declaration file will show this as number
+>x : number
+>"hello" : string
+

tests/baselines/reference/jsFileCompilationDuplicateVariableErrorReported.errors.txt

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+tests/cases/compiler/a.ts(1,5): error TS2403: Subsequent variable declarations must have the same type.  Variable 'x' must be of type 'string', but here has type 'number'.
+
+
+==== tests/cases/compiler/b.js (0 errors) ====
+    var x = "hello";
+    
+==== tests/cases/compiler/a.ts (1 errors) ====
+    var x = 10; // Error reported so no declaration file generated?
+        ~
+!!! error TS2403: Subsequent variable declarations must have the same type.  Variable 'x' must be of type 'string', but here has type 'number'.

tests/baselines/reference/jsFileCompilationDuplicateVariableErrorReported.js

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+//// [tests/cases/compiler/jsFileCompilationDuplicateVariableErrorReported.ts] ////
+
+//// [b.js]
+var x = "hello";
+
+//// [a.ts]
+var x = 10; // Error reported so no declaration file generated?
+
+//// [out.js]
+var x = "hello";
+var x = 10; // Error reported so no declaration file generated?
+
+
+//// [out.d.ts]
+declare var x: string;
+declare var x: string;

tests/cases/compiler/jsFileCompilationDuplicateVariable.ts

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+// @jsExtensions: js
+// @out: out.js
+// @declaration: true
+// @filename: a.ts
+var x = 10;
+
+// @filename: b.js
+var x = "hello"; // No error is recorded here and declaration file will show this as number

tests/cases/compiler/jsFileCompilationDuplicateVariableErrorReported.ts

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+// @jsExtensions: js
+// @out: out.js
+// @declaration: true
+// @filename: b.js
+var x = "hello";
+
+// @filename: a.ts
+var x = 10; // Error reported so no declaration file generated?