Changes

Re-apply "[ELF] Allow getErrPlace() to work before Out::bufferStart is
set"
This time with a fix for the UBSAN failure.
Differential Revision: https://reviews.llvm.org/D70659

MipsDelaySlotFiller: Update registers def-uses for BUNDLE instructions
Summary: In commit b91f239485fb7bb8d29be3e0b60660a2de7570a9 I updated
the MipsDelaySlotFiller to skip BUNDLE instructions. However, in
addition to not considering BUNDLE instructions for the delay slot, we
also need to ensure that the register def-use information is updated.
Not updating this information caused run-time crashes (when using the
out-of-tree CHERI backend) since later definitions could be overwritten 
with earlier register values.
Reviewers: atanasyan Reviewed By: atanasyan Differential Revision:
https://reviews.llvm.org/D72254

[mlir] NFC: Move the state for managing SSA value names out of
OperationPrinter and into a new class SSANameState.
Summary: This reduces the complexity of OperationPrinter and simplifies
the code by quite a bit. The SSANameState is now held by ModuleState.
This is in preparation for a future revision that molds ModuleState into
something that can be used by users for caching the printer state, as
well as for implementing printAsOperand style methods.
Depends On D72292
Reviewed By: antiagainst
Differential Revision: https://reviews.llvm.org/D72293

[libc++] Explicitly enumerate std::string external instantiations.
 The external instantiation of std::string is a problem for libc++.
   Additions and removals of inline functions in string can cause ABI
   breakages, including introducing new symbols.
    This patch aims to:
     (1) Make clear which functions are explicitly instatiated.
     (2) Prevent new functions from being accidentally instantiated.
     (3) Allow a migration path for adding or removing functions from
the
     explicit instantiation over time.
    Although this new formulation is uglier, it is preferable from a
   maintainability and readability standpoint because it explicitly
   enumerates the functions we've chosen to expose in our ABI. Changing
   this list is non-trivial and requires thought and planning.
    (3) is achieved by making it possible to control the extern template
declaration
   separately from it's definition. Meaning we could add a new
definition to
   the dylib, wait for it to roll out, then add the extern template
   declaration to the header. Similarly, we could remove existing extern
   template declarations while still keeping the definition to prevent
ABI
   breakages.

[clang-tidy] Refresh the add_new_check.py now that we use a table +
autofix
Reviewers: alexfh
Reviewed By: alexfh
Subscribers: njames93, xazax.hun, mgorny, cfe-commits
Tags: #clang, #clang-tools-extra
Differential Revision: https://reviews.llvm.org/D72421