Test cases for let declaration and its use order

tests/baselines/reference/jsFileCompilationLetDeclarationOrder.js

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+//// [tests/cases/compiler/jsFileCompilationLetDeclarationOrder.ts] ////
+
+//// [b.js]
+let a = 10;
+b = 30;
+
+//// [a.ts]
+let b = 30;
+a = 10;
+
+
+//// [out.js]
+var a = 10;
+b = 30;
+var b = 30;
+a = 10;
+
+
+//// [out.d.ts]
+declare let a: number;
+declare let b: number;

tests/baselines/reference/jsFileCompilationLetDeclarationOrder.symbols

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+=== tests/cases/compiler/b.js ===
+let a = 10;
+>a : Symbol(a, Decl(b.js, 0, 3))
+
+b = 30;
+>b : Symbol(b, Decl(a.ts, 0, 3))
+
+=== tests/cases/compiler/a.ts ===
+let b = 30;
+>b : Symbol(b, Decl(a.ts, 0, 3))
+
+a = 10;
+>a : Symbol(a, Decl(b.js, 0, 3))
+

tests/baselines/reference/jsFileCompilationLetDeclarationOrder.types

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+=== tests/cases/compiler/b.js ===
+let a = 10;
+>a : number
+>10 : number
+
+b = 30;
+>b = 30 : number
+>b : number
+>30 : number
+
+=== tests/cases/compiler/a.ts ===
+let b = 30;
+>b : number
+>30 : number
+
+a = 10;
+>a = 10 : number
+>a : number
+>10 : number
+

tests/baselines/reference/jsFileCompilationLetDeclarationOrder2.errors.txt

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+tests/cases/compiler/a.ts(2,1): error TS2448: Block-scoped variable 'a' used before its declaration.
+
+
+==== tests/cases/compiler/a.ts (1 errors) ====
+    let b = 30;
+    a = 10;
+    ~
+!!! error TS2448: Block-scoped variable 'a' used before its declaration.
+==== tests/cases/compiler/b.js (0 errors) ====
+    let a = 10;
+    b = 30;
+    

tests/baselines/reference/jsFileCompilationLetDeclarationOrder2.js

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+//// [tests/cases/compiler/jsFileCompilationLetDeclarationOrder2.ts] ////
+
+//// [a.ts]
+let b = 30;
+a = 10;
+//// [b.js]
+let a = 10;
+b = 30;
+
+
+//// [out.js]
+var b = 30;
+a = 10;
+var a = 10;
+b = 30;
+
+
+//// [out.d.ts]
+declare let b: number;
+declare let a: number;

tests/cases/compiler/jsFileCompilationLetDeclarationOrder.ts

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+// @jsExtensions: js
+// @out: out.js
+// @declaration: true
+// @filename: b.js
+let a = 10;
+b = 30;
+
+// @filename: a.ts
+let b = 30;
+a = 10;

tests/cases/compiler/jsFileCompilationLetDeclarationOrder2.ts

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+// @jsExtensions: js
+// @out: out.js
+// @declaration: true
+// @filename: a.ts
+let b = 30;
+a = 10;
+// @filename: b.js
+let a = 10;
+b = 30;