[Fix #8800] Emit comments after open braces

[HerringtonDarkholme]

Fixes #8800

Comments after open braces are neither leading comments of statments nor trailing comments of block.
This pull request compensates missing comments after writing braces.

[msftclas]

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[HerringtonDarkholme]

@mhegazy would you like have a look on this, if you're available?

[mhegazy]

@HerringtonDarkholme extremely sorry for the long delay. got busy with TS 2.0 for a while.
With #5595, unfortunately this PR is obsolete. The bug persists though; It would be great if you can "port" this change to the new emitter. Since moving this to the new emitter is tantamount to rewriting it, I will go ahead and close this PR. again sorry for the long delay, hopefully future PRs would not have to sit for this long before being merged in.