[clang] NFCI: use TemplateArgumentLoc for type-param DefaultArgument (#92854)

This is an enabler for a future patch.

This allows an type-parameter default argument to be set as an arbitrary
Temp

[clang] NFCI: use TemplateArgumentLoc for type-param DefaultArgument (#92854)

This is an enabler for a future patch.

This allows an type-parameter default argument to be set as an arbitrary
TemplateArgument, not just a type.
This allows template parameter packs to have default arguments in the
AST, even though the language proper doesn't support the syntax for it.

This will be used in a later patch which synthesizes template parameter
lists with arbitrary default arguments taken from template
specializations.

There are a few places we used SubsType, because we only had a type, now
we use SubstTemplateArgument.
SubstTemplateArgument was missing arguments for setting Instantiation
location and entity names.
Adding those is needed so we don't regress in diagnostics.

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[clang-tidy] Fix crash in modernize-use-constraints (#92019)

Improved modernize-use-constraints check by fixing a crash that occurred
in some scenarios and excluded system headers from analysis.

[clang-tidy] Fix crash in modernize-use-constraints (#92019)

Improved modernize-use-constraints check by fixing a crash that occurred
in some scenarios and excluded system headers from analysis.

Problem were with DependentNameTypeLoc having null type location as
getQualifierLoc().getTypeLoc().

Fixes #91872

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[clang-tidy][NFC] replace comparison of begin and end iterators with range empty (#91994)

Improves readability by changing comparisons of `*_begin` and `*_end`
iterators into `.empty()` on their ra

[clang-tidy][NFC] replace comparison of begin and end iterators with range empty (#91994)

Improves readability by changing comparisons of `*_begin` and `*_end`
iterators into `.empty()` on their range.

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[clang][NFC] Refactor ElaboratedTypeKeyword

This patch moves ElaboratedTypeKeyword before `Type` definition so that the enum is complete where bit-field for it is declared. It also converts it to sc

[clang][NFC] Refactor ElaboratedTypeKeyword

This patch moves ElaboratedTypeKeyword before `Type` definition so that the enum is complete where bit-field for it is declared. It also converts it to scoped enum and removes `ETK_` prefix.

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[clang-tidy][NFC] Fix llvm-else-after-return findings

Fix issues found by clang-tidy in clang-tidy source directory.

[clang-tidy][NFC] Fix modernize-return-braced-init-list findings

Fix issues found by clang-tidy in clang-tidy source directory.

[clang-tidy][NFC] Fix readability-container-size-empty findings

Fix issues found by clang-tidy in clang-tidy source directory.

[clang-tidy] Implement modernize-use-constraints

Add new check to replace enable_if with C++20 constraints

Reviewed By: PiotrZSL

Differential Revision: https://reviews.llvm.org/D141892