[PATCH] [coroutines] Rename driver flag -fcoroutines to -fcoroutines-ts

[Gor Nishanov via cfe-commits]

Currently the -fcoroutines flag is a CC1 only flag. It really should be
both a Driver and CC1 flag. This patch fixes the option and adds tests for
the new options.

Also adds a __has_feature for coroutines.
Patch is mostly by Eric Fiselier
.
Meticulous and painstaking extraction from the larger coroutine branch by
Gor Nishanov

P.S.

Switching to lowercase [coroutines] tag in the title, as most of the
coroutine commits in cfe were done with lowercase tag.
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