These are the callsites that have materialised in the last three weeks
since I last built with deprecation warnings.

This is an almost-final step in eliminating debug-intrinsics -- read more
about that here: https://llvm.org/docs/RemoveDIsDebugInfo.html . To
correctly update variable location information in the background when
inserting instructions, we need some information carried at runtime in
BasicBlock::iterator, hence deprecating pointer-insertion.
                                                                                                                                                                                                                 An immediate fix for any deprecation warnings is to call "getIterator"
on the insertion position pointer. If you intend on inserting at the start
of a block, use BB->begin() or similar methods to fetch the appropriate
iterator. 

This is part of effort in removing -enable-new-pm flag.
As a prat of this effort one of example passes SimplifyCFG must
be ported to new PM which will allow to remove the flag
calls from the tests that are using this pass.

Reviewed By: aeubanks

Differential Revision: https://reviews.llvm.org/D137103

After fffabd53482f34f96ab9273486538f587e3d91fc, the v2 and v3
versions produce poison instead of undef. Also adjust the v1
version, as well as the test expectations, to make the example
pass again.

These look like they have intentional side effects that would break from
shortcircuiting.

... under the EXPENSIVE_CHECKS build, this fails the assert in the LegacyPM
that verifies whether a pass really did leave the IR alone when it reports no
changes back from its return status.

This reverts commit 19fd8925a4afe6efd248688cce06aceff50efe0c.

Should include a fix for PR44197.

This breaks LLVMExports.cmake in some build configurations.

PR44197

This reverts commits ceb72d07b004af9c428c4a3c73a98ea97d49a713
                     7d0b1d77b3d4d47df477519fd1bf099b3df6f899.

This file lists every pass in LLVM, and is included by Pass.h, which is
very popular. Every time we add, remove, or rename a pass in LLVM, it
caused lots of recompilation.

I found this fact by looking at this table, which is sorted by the
number of times a file was changed over the last 100,000 git commits
multiplied by the number of object files that depend on it in the
current checkout:
  recompiles    touches affected_files  header
  342380        95      3604    llvm/include/llvm/ADT/STLExtras.h
  314730        234     1345    llvm/include/llvm/InitializePasses.h
  307036        118     2602    llvm/include/llvm/ADT/APInt.h
  213049        59      3611    llvm/include/llvm/Support/MathExtras.h
  170422        47      3626    llvm/include/llvm/Support/Compiler.h
  162225        45      3605    llvm/include/llvm/ADT/Optional.h
  158319        63      2513    llvm/include/llvm/ADT/Triple.h
  140322        39      3598    llvm/include/llvm/ADT/StringRef.h
  137647        59      2333    llvm/include/llvm/Support/Error.h
  131619        73      1803    llvm/include/llvm/Support/FileSystem.h

Before this change, touching InitializePasses.h would cause 1345 files
to recompile. After this change, touching it only causes 550 compiles in
an incremental rebuild.

Reviewers: bkramer, asbirlea, bollu, jdoerfert

Differential Revision: https://reviews.llvm.org/D70211

This patch adds a new IRTransformations directory to llvm/examples/. This is
intended to serve as a new home for example transformations/analysis
code used by various tutorials.

If LLVM_BUILD_EXAMPLES is enabled, the ExamplesIRTransforms library is
linked into the opt binary and the example passes become available.

To start off with, it contains the CFG simplifications used in the IR
part of the 'Getting Started With LLVM: Basics' tutorial at the US LLVM
Developers Meeting 2019.

Reviewers: paquette, jfb, meikeb, lhames, kbarton

Reviewed By: paquette

Differential Revision: https://reviews.llvm.org/D69416