[clang] [clang][SSAF] Allow no Data for summary analysis (PR #211342)

[Balázs Benics via cfe-commits]

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@@ -15,13 +15,13 @@
 // UNKNOWN: no analysis registered for 'AnalysisName(NoSuchAnalysis)'
 
 // ============================================================================
-// Error: valid analysis name but LUSummary lacks entity data for it
+// Success: Analyese might not add summaries in every run.
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steakhal wrote:

You caught me. I wrote this myself. - human slop xD

https://github.com/llvm/llvm-project/pull/211342