To  Fix Issue 802 , WIP
Ran tests Around 76 failures ( conformance + Compiler ) Most of them are invalid.
Few Questions
1) tests/cases/compiler/conditionallyDuplicateOverloadsCausedByOverloadResolution.ts
    Question - line 5 & 6 , (Failed) How to handle this ?

2) tests/cases/compiler/declFileForClassWithPrivateOverloadedFunction.ts
    Question - baseline file is changed . declFileForClassWithPrivateOverloadedFunction.d.ts has duplicate overload
    shall we ignore d.ts files ?

3) tests/cases/compiler/declFileMethods_0.d.ts
    Question - Similar to Q2

4) tests/cases/compiler/declFilePrivateMethodOverloads.d.ts
    baseline file changed . Similar to Q2

5) tests/cases/compiler/intTypeCheck.ts
    Question - line 82 and 83 . optional properties - I think we should not throw error here

6) tests/cases/compiler/mixedExports.ts
    Question - line 2 & 3 & 4 with export keyword . i think this is valid to throw error

7) tests/cases/compiler/overloadsWithConstraints.ts
  Question : (Failed) how to handle this ?