Changes

Support: Add closing namespace comment in raw_ostream_test.cpp, NFC

The closing namespace comment prevents clang-format from dropping a
blank line after the final test. Also add in a blank line (which
simplifies merging/rebasing/etc. WIP patches).

Revert "[Polly] Implement user-directed loop distribution/fission."

This reverts commit 52c30adc7dfe6334b71adf256d81f70e7b976143 which
breaks the build when NDEBUG is defined.

[clang-format] NFC ensure Penality variable is passed back with Fixes

Fix set but not used warning

[clangd] Support `#pragma mark` in the outline

Xcode uses `#pragma mark -` to draw a divider in the outline view
and `#pragma mark Note` to add `Note` in the outline view. For more
information, see https://nshipster.com/pragma/.

Since the LSP spec doesn't contain dividers for the symbol outline,
instead we treat `#pragma mark -` as a group with children - the
decls that come after it, implicitly terminating when the symbol's
parent ends.

The following code:

```
@implementation MyClass

- (id)init {}

- (int)foo;
@end
```

Would give an outline like

```
MyClass
        > Overrides
                    > init
        > Public Accessors
                    > foo
```

Differential Revision: https://reviews.llvm.org/D105904

[CMake] Pass llvm-readelf to CMake external builds

This matches other LLVM binary tools.

Differential Revision: https://reviews.llvm.org/D110313

[RISCV] Add more tests for (and (shl x, C2), C1) that can be improved by using a pair of shifts. NFC

These tests have C1 as a shifted mask having no leading zeros and
C3 trailing zeros. If C3 is more than C2, we can select this as
(slli (srli x, C3-C2), C3).

[RISCV] Add another isel optimization for (and (shl x, c2), c1)

Turn (and (shl x, c2), c1) -> (slli (srli x, c3-c2), c3) if c1 is a
shifted mask with no leading zeros and c3 trailing zeros where c3
is greater than c2.

RegAllocGreedy: Remove an unhelpful auto, and don't use a reference

[OpenMP] Fix data-race in new device RTL

This patch fixes a data-race observed when using the new device runtime
library. The Internal control variable for the parallel level is read in
the `__kmpc_parallel_51` function while it could potentially be written
by other threads. This causes data corruption and will cause
nondetermistic behaviour in the runtime. This patch fixes this by adding
an explicit synchronization before the region starts.

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D110366

[lldb] Handle malformed qfThreadInfo reply

If the remote gdbserver's qfThreadInfo reply has a trailing comma,
GDBRemoteCommunicationClient::GetCurrentProcessAndThreadIDs will return
an empty vector of thread ids. This will cause lldb to recurse through
three functions trying to get the list of threads, until it blows its
stack and crashes.

A trailing comma is a malformed response, but it shouldn't cause lldb to
crash. This patch will return the tids received before the malformed
response.

Reviewed By: clayborg, labath

Differential Revision: https://reviews.llvm.org/D109937

[profile][fuchsia] Don't include extra NUL in log messages

Reviewed By: phosek

Differential Revision: https://reviews.llvm.org/D110361

[AMDGPU] Propagate defining src reg for AGPR to AGPR Copys

On targets that do not support AGPR to AGPR copying directly, try to find the
defining accvgpr_write and propagate its source vgpr register to the copies
before register allocation so the source vgpr register does not get clobbered.

The postrapseudos pass also attempt to propagate the defining accvgpr_write but
if the register to propagate is clobbered, it will give up and create new
temporary vgpr registers instead.

Reviewed By: rampitec

Differential Revision: https://reviews.llvm.org/D108830

[libc++][NFC] Refactor the std::reverse_view tests

Mostly, remove the global assumption that all ranges have size 8.
I should have called this out during the initial review.

[ORC] Fix file header.

Revert "[compiler-rt][profile] Add padding after binary IDs"

This reverts commit 6bc9c8dfe32cc4662f2ed9041af527f69dfff13b.

Reverted because this broke some PPC buildbots.

[CSSPGO] Do not pass -fpseudo-probe-for-profiling to the linker.

The correponding linker switch has been removed by https://reviews.llvm.org/D110209, so do not pass it in clang.

Reviewed By: wenlei

Differential Revision: https://reviews.llvm.org/D110371

[RISCV] Limit transformAddImmMulImm to prevent an infinite loop.

This fixes an issue reported in D108607.

[NFC] Refactor tests to improve readability.

Fix -fno-unwind-tables -fasynchronous-unwind-tables to emit unwind tables

This matches GCC.

Change the CC1 option to encode the unwind table level (1: needed by exceptions,
2: asynchronous) so that we can support two modes in the future.

[clang-format] Fix unittest failures with -Werror

Commit a44ab1702539 added a unit test that fails to build with
-Werror which causes build bot breaks on bots that include that
option in their build. This patch just adds the necessary casts to
silence the warnings.

[ORC] Shut down services in SimpleRemoteEPCServer.

This should have been included with ExecutorBootstrapService in 78b083dbb72,
but was accidentally left out. It give services a chance to release any
resources that they have acquired.