[4.0] RangeInfo: Add several defensive null pointer checks. rdar://32047178 #11732
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Explanation: This patch adds several null pointer checks in the range info resolver to ensure available refactoring requests don't crash sourcekitd service.
Radar: rdar://problem/32047178
Risk: Very Low; just add several defensive null pointer checks.
Testing: The original reproducing test case is long and hard to reduce. Since the patch only adds null pointer checks, existing tests cover all of the unchanged behaviors.