Update ROOT and Cling to LLVM20#19242

Merged

dpiparo merged 16 commits intoroot-project:masterfrom

devajithvs:ROOT-llvm20

Oct 7, 2025

Commits on Oct 6, 2025

Import ROOT-llvm20

devajithvs
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hahnjo
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[cling][LLVM20] Misc adaptations for updated APIs

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[cling][LLVM20] Use TemplateArgumentLoc for type-param DefaultArgument

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[cling] Adapt to LLVM 20 OptTable changes

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[cling] ProcessWarningOptions now requires VFS

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[cling][LLVM20] Adapt to LLVM20 enum changes

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[core][LLVM20] Adapt to LLVM 20 API changes

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[roottest] Fix ErrorDiagnostics test

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[cling][test] Add a new expected warning post LLVM20

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[cling][AST] Desugar TemplateName before fully qualifying it

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[cling] Avoid const-eval of RecoveryExpr in type/name lookup

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[cling] Fix missing space before attributes in ForwardDeclPrinter

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[cling] Remove usage of deprecated `getDirectory` and `getFileRef` methods

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[cling] Skip invalid TopLevelStmtDecls in dumps

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[interpreter] Fix Windows build failures with LLVM 20

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[TClingUtils] Fix normalization of variadic template classes

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