Compiler crashes when emitting declaration for malformed interface

TypeScript Version: nightly, with --declaration flag, also reproducable with stable version
Code

// @declaration
class A {}
interface Class extends (typeof A) {}

Expected behavior:
Report error like without --declaration flag.

Actual behavior:
Crashes with Cannot read property 'heritageClauses' of undefined in writeInterfaceDeclaration

Handle the scenario when heritage clause of interface is not entity n…

Merge pull request #12363 from Microsoft/declarationsInFilesWithErrors

Handle the scenario when heritage clause of interface is not entity n…

Merge pull request #12366 from Microsoft/declarationsInFilesWithErrors

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