[Parser] Preserve empty getter functions for indentation (3.0) #4592
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[Parser] Preserve empty getter functions to make sure indentation inside its body still works. rdar://28049927
Explanation: Indentation is unavailable when users hit enter inside an empty block of getter function. The root cause is that parser dropped empty getter functions, leading SourceKit to believe there are nothing interesting at the indentation position. This patch starts to preserve empty getter functions.
Scope of issue: Low
Risk: Low
Reviewed By: Argyrios
Radar: rdar://28049927
Resolves SR-NNNN.