Changes

SplitKit: Remove decade old live interval hack

This was trying to fixup broken live intervals coming out of the
coalescer. The verifier is more complete now and no tests seem to fail
without this.

Revert use of getUniqueUndroppableUser in AssumeBundleBuilder

Fix build bot failure in rG4ac4e521 caused due to assumeBundleBuilder
using new API (getUniqueUndroppableUser).
We now continue using the existing API for AssumeBundleBuilder
(getSingleUndroppableUser).

Sorry for the noise here.

Tests-Run: failing testcase passes.

NFC: DWARFTypePrinter: Remove "type" from member function names to reduce redundancy

[clang-format] Top-level unwrapped lines don't follow a left brace

Differential Revision: https://reviews.llvm.org/D109752

Revert "[InstCombine] Improve TryToSinkInstruction with multiple uses"

This reverts commit 4ac4e52189aa6d80c3d59dc2c8f7dcc0cb7f9d58.
There are couple of test failures, which needs update of the test cases.

Doing a clean revert and will recommit the change along with fixed
testcases.

Teach SimplifyCFG to fold switches into lookup tables in more cases.

In particular, it couldn't handle cases where lookup table constant
expressions involved bitcasts. This does not seem to come up
frequently in C++, but comes up reasonably often in Rust via
`#[derive(Debug)]`.

Originally reported by pcwalton.

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D109565

[Polly] Remove autotools build systems from Externals. NFC.

Building a source distribution using autotools adds GPL-licenced
files into the the sources. Although redistribution of theses files is
explicitly allowed with an exception, these are not used by Polly
which uses a CMake replacement. Use the direct source checkout
instead (replacing the output of 'make dist').

Some m4 scripts with the same licence are also included in isl/ppcg
repository. Removing them renders the autotools-based build scipts
inoperable, so remove the autotools build system altogether.

[gn build] Port d249200fa7d5

[NFC] Split up PassBuilder.cpp

PassBuilder.cpp is the slowest file to compile in LLVM.
When trying to test changes to pipelines, it takes a long time to recompile.

This doesn't actually speedup building PassBuilder.cpp itself since most
of the time is spent in other large/duplicated functions caused by
PassRegistry.def.

Reviewed By: asbirlea

Differential Revision: https://reviews.llvm.org/D109798

[test] Move some llvm-extract tests into the proper directory

PR51874: Fix diagnostics for defaulted, implicitly deleted 'operator!='.

Don't say we couldn't find an 'operator<=>' when we were actually
looking for an 'operator=='. Also fix a crash when attempting to
diagnose if we select a built-in 'operator!=' in this lookup.

[MemProf] Avoid global lock when updating MIB cache

Previously we used a global Allocator-scope mutex to lock when adding a
deallocation to the MIB cache. This resulted in a lot of contention.
Instead add and use per-set mutexes.

Along with this, we now need to remove the global miss and access count
variables and instead utilize the per-set statistics to report the
overall miss rate.

Differential Revision: https://reviews.llvm.org/D109853

[lldb-vscode] Fix focus thread when previous thread exits

The thread that Visual Studio Code displays on a stop is called the focus thread. When the previous focus thread exits and we stop in a new thread, lldb-vscode does not tell vscode to set the new thread as the focus thread, so it selects the first thread in the thread list.

This patch changes lldb-vscode to tell vscode that the new thread is the focus thread. It also includes a test that verifies the DAP stop message for this case contains the correct values.

Reviewed By: clayborg, wallace

Differential Revision: https://reviews.llvm.org/D109633