Added tests to show when teh literal is preserved and when not.

Author: dragomirtitian

tests/cases/compiler/verbatimDeclarationConstLiterals.ts

@@ -6,4 +6,19 @@ enum E { "some value" = 1 };
 const e: typeof E["some value"] = E["some value"];
 
 declare function f3<T>(a: T, b: T): T;
-const x3 = f3("abc", "def");  // "abc" | "def"
+const x3 = f3("abc", "def");  // "abc" | "def"
+
+const octal = 0o16;
+const octalIndirect = octal;
+
+const hex = 0x10;
+const hexIndirect = hex;
+
+const seps = 1_000_000;
+const sepsIndirect = seps;
+
+const singleQuote = 'x'
+const singleQuoteIndirect = singleQuote;
+
+const noSubstTemplate = `Test`
+const noSubstTemplateIndirect = noSubstTemplate;