Add support for a declaration attribute @warn for source-level warning group behavior control
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@warn for source-level warning group behavior control
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…ing group behavior control
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…nostic Unified across module-wide configuration flags (`-Wwarning`, `-Werror`, etc.) and syntactic configuration attribute `@warn`.
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This PR contains two changes/commits:
Add parsing for an experimental declaration attribute '@warn' for source-level warning group behavior control. This attribute is gated behind an experimental feature
SourceWarningControl.Implement support for unified warning group behavior queries per-diagnostic-group:
-Wwarningand-Werrorflags, as well asDefaultIgnorediagnostic groups to be captured as aWarningGroupBehaviorRule(as opposed to a priorWarningAsErrorRule) and replace the corresponding diagnostic group ID-indexed bit vectors inDiagnosticEnginewith with a dictionary keyed by the diagnostic group ID with values representing behavior specification rules (such asAsError,AsWarning,Ignored).SwiftWarningControlSwiftSyntax library for a given warning diagnostic's diagnostic group's emission behavior at the diagnostic's source location, as determined by syntactic@warncontrols. (Implemented inASTGen/WarningGroupBehaviorConfiguration.swift).SwiftWarningControlquery as global control inputs. This means the same query will take into account both global warning control rules specified on the command-line, as well as source-location-specific containing@warnattribute controls.ExportedSourceFile, the first query ofwarningGroupBehaviorAtPositionwill result in construction of aWarningControlRegionTreedata-structure which will be cached in theExportedSourceFileit belongs to and re-used for future queries.