Add nuw attribute to inbounds GEPs where the expression used to form the
GEP is an addition of unsigned indices.

Relands #105496, which was reverted because it exposed a miscompilation
arising from #98608. This is now fixed by #106512.

Reverts llvm/llvm-project#105496

This patch breaks:
https://lab.llvm.org/buildbot/#/builders/25/builds/1952
https://lab.llvm.org/buildbot/#/builders/52/builds/1775

Somehow output is different with sanitizers.
Maybe non-determinism in the code?

Add nuw attribute to inbounds GEPs where the expression used to form the
GEP is an addition of unsigned indices.

Generate nuw GEPs for struct member accesses, as inbounds + non-negative
implies nuw.

Regression tests are updated using update scripts where possible, and by
find + replace where not.

Just re-running the script to make future updates easier

This allows use with non-0 address space stacks. llvm_ptr_ty should
never be used. This could use some more percolation up through mlir,
but this is enough to fix existing tests.

https://reviews.llvm.org/D156666

Avoid diffs from no longer hardcoding metadata checks

We use this helper to make several internal global variables during
codegen. currently we do not specify any alignment which allows the
alignment to be set incorrectly after some changes in how alignment was
handled. This patch explicitly aligns these variables to the natural
alignment as specified by the data layout

Fixes https://github.com/llvm/llvm-project/issues/62668

Reviewed By: tianshilei1992, gchatelet

Differential Revision: https://reviews.llvm.org/D150461

Extend the existing fold for division by zero or one to use known
bits, so it catches additional patterns like division by
(1 srem b).

Fixes https://github.com/llvm/llvm-project/issues/62163.

Differential Revision: https://reviews.llvm.org/D149001

This patch prefixes omp outlined helpers and reduction funcs
with the original function's name.

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D140722