[clang] Make -Wpadded cause us to check the layout immediately, always checking (PR #206820)

[Aaron Ballman via cfe-commits]

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@@ -962,6 +962,16 @@ class DiagnosticsEngine : public RefCountedBase<DiagnosticsEngine> {
            diag::Severity::Ignored;
   }
 
+  bool areAllIgnored(StringRef Group, SourceLocation Loc) const {
+    llvm::SmallVector<diag::kind> diagsInGroup;
+    bool Failed = Diags->getDiagnosticsInGroup(diag::Flavor::WarningOrError,
+                                               Group, diagsInGroup);
+    assert(!Failed && "Incorrect group name?");
+    (void)Failed;
+    return Diags->getDiagnosticListHighestSeverity(diagsInGroup, Loc, *this) ==
+           diag::Severity::Ignored;
+  }
+
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AaronBallman wrote:

Absolutely fine to split that work off, good call!

https://github.com/llvm/llvm-project/pull/206820