Rintaro Ishizaki 62c44126b6 [SourceKit] Reuse compiler instance between multiple completion ...

- Introduce ide::CompletionInstance to manage CompilerInstance
- `CompletionInstance` vends the cached CompilerInstance when:
-- The compiler arguments (i.e. CompilerInvocation) has has not changed
-- The primary file is the same
-- The completion happens inside function bodies in both previous and
   current completion
-- The interface hash of the primary file has not changed
- Otherwise, it vends a fresh CompilerInstance and cache it for the next
  completion

rdar://problem/20787086

2019-12-18 21:52:20 -08:00

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