Changes

[PowerPC] iterate on the SmallSet directly; NFC

Add basic aarch64-none-elf bare metal driver.

Differential Revision: https://reviews.llvm.org/D111134

[clang][ASTImporter] Fix for importing functions with EST_Unevaluated prototype.

Fix for importing functions where the TypeSourceInfo is set and the
exception specification information contains reference to the function
declaration itself.

Reviewed By: martong, steakhal

Differential Revision: https://reviews.llvm.org/D112013

[fir] Add utility function to FIRBuilder and MutableBox

This patch is extracted from D111337 to make is smaller.
It introduce utility functions to the FIRBuilder and add the MutableBox
files.

- genShape
- readCharLen
- getExtents

Reviewed By: kiranchandramohan

Differential Revision: https://reviews.llvm.org/D112207

Co-authored-by: Jean Perier <jperier@nvidia.com>
Co-authored-by: Eric Schweitz <eschweitz@nvidia.com>

[lldb] Fix TestCompressedVectors after array type name change

aee49255074fd4ef38d97e6e70cbfbf2f9fd0fa7 turns array names such as `int [1]`
into `int[1]` (without the space). This probably breaks some user formatters,
but let's first get this test running while this is being discussed.

[lldb] Remove ConstString from ABI, Architecture and Disassembler plugin names

[Analyzer][NFC] Move RangeConstraintManager's def before ConstraintAssignor's def

In this patch we simply move the definition of RangeConstraintManager before
the definition of ConstraintAssignor. This patch is exclusively needed for it's
child patch, so in the child the diff would be clean and the review would be
easier.

Differential Revision: https://reviews.llvm.org/D110387

[Analyzer][NFC] Add RangedConstraintManager to ConstraintAssignor

In this patch we store a reference to `RangedConstraintManager` in the
`ConstraintAssignor`. This way it is possible to call back and reuse some
functions of it. This patch is exclusively needed for its child patches,
it is not intended to be a standalone patch.

Differential Revision: https://reviews.llvm.org/D111640

[Analyzer] Extend ConstraintAssignor to handle remainder op

Summary:
`a % b != 0` implies that `a != 0` for any `a` and `b`. This patch
extends the ConstraintAssignor to do just that. In fact, we could do
something similar with division and in case of multiplications we could
have some other inferences, but I'd like to keep these for future
patches.

Fixes https://bugs.llvm.org/show_bug.cgi?id=51940

Reviewers: noq, vsavchenko, steakhal, szelethus, asdenyspetrov

Subscribers:

Differential Revision: https://reviews.llvm.org/D110357

Fix baremetal.cpp test to handle windows paths.

Fix flake8 failures

Fix flake8 failures when running tox and add a note in the README to run
tox for testing patches.

Reviewed By: tnfchris

Differential Revision: https://reviews.llvm.org/D112304