[Clang] [Sema] Diagnose unknown std::initializer_list layout in SemaInit (#95580)

This checks if the layout of `std::initializer_list` is something Clang
can handle much earlier and deduplicates th

[Clang] [Sema] Diagnose unknown std::initializer_list layout in SemaInit (#95580)

This checks if the layout of `std::initializer_list` is something Clang
can handle much earlier and deduplicates the checks in
CodeGen/CGExprAgg.cpp and AST/ExprConstant.cpp

Also now diagnose `union initializer_list` (Fixes #95495), bit-field for
the size (Fixes a crash that would happen during codegen if it were
unnamed), base classes (that wouldn't be initialized) and polymorphic
classes (whose vtable pointer wouldn't be initialized).

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[clang-tidy] Fix bug in modernize-use-emplace (#66169)

emplace_back cannot construct an aggregate with arguments used to
initialize the aggregate.
Closes #62387

Test plan: Added test test from

[clang-tidy] Fix bug in modernize-use-emplace (#66169)

emplace_back cannot construct an aggregate with arguments used to
initialize the aggregate.
Closes #62387

Test plan: Added test test from #62387 which contains code that should
not be replaced by the check.

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[clang-tidy][NFC] Update tests to specify CheckOptions using new syntax

In D128337, The spelling of CheckOptions was updated to support a more natural dictionary syntax.
This patch is just updating

[clang-tidy][NFC] Update tests to specify CheckOptions using new syntax

In D128337, The spelling of CheckOptions was updated to support a more natural dictionary syntax.
This patch is just updating all test files to use the new syntax.

Reviewed By: PiotrZSL

Differential Revision: https://reviews.llvm.org/D130209

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Fix handling of -> calls for modernize-use-emplace

Fixes #55869

Reviewed By: njames93, nicovank

Differential Revision: https://reviews.llvm.org/D142939

Fix handling of braced-init temporaries for modernize-use-emplace

Fixes #55870

Differential Revision: https://reviews.llvm.org/D135405

[clang-tidy] Fix modernize-use-emplace to support alias cases

Fix modernize-use-emplace to support alias cases

Reviewed By: njames93

Differential Revision: https://reviews.llvm.org/D132640

[clang-tidy] Improve modernize-use-emplace check

This patch improves the modernize-use-emplace check by adding support for
detecting inefficient invocations of the `push` and `push_front` methods on

[clang-tidy] Improve modernize-use-emplace check

This patch improves the modernize-use-emplace check by adding support for
detecting inefficient invocations of the `push` and `push_front` methods on
STL-style containers and replacing them with their `emplace`-style equivalent.

Fixes #56996.

Reviewed By: njames93

Differential Revision: https://reviews.llvm.org/D131623

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[clang-tidy] Organize test files into subdirectories by module (NFC)

Eliminate clutter by reorganizing the Lit test files for clang-tidy:
- Move checkers/<module>-* to checkers/<module>/*.
- Move mo

[clang-tidy] Organize test files into subdirectories by module (NFC)

Eliminate clutter by reorganizing the Lit test files for clang-tidy:
- Move checkers/<module>-* to checkers/<module>/*.
- Move module specific inputs from Inputs to <module>/Inputs. Remove
any module prefix from the file or subdirectory name as they are no
longer needed.
- Introduce a Lit substitution %clang_tidy_headers for the system
headers in checkers/Inputs/Headers and use this throughout. This
avoids referencing system headers through a relative path to the
parent directory and makes it clear that these fake system headers are
shared among all modules.
- Update add_new_check.py to follow the above conventions when creating
the boiler plate test files for a new check.
- Update Contributing.rst to describe per-module Inputs directory and
fix link to test source code.

Differential Revision: https://reviews.llvm.org/D128072

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