Changes

[ELF][NFCI] small cleanup to OutputSections.h

OutputSections.h used to close the lld::elf namespace only to
immediately open it again. This change merges both parts into
one.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D94538

Add sample-profile-suffix-elision-policy attribute with -funique-internal-linkage-names.

Adding sample-profile-suffix-elision-policy attribute to functions whose linkage names are uniquefied so that their unique name suffix won't be trimmed when applying AutoFDO profiles.

Reviewed By: dblaikie

Differential Revision: https://reviews.llvm.org/D94455

[MIPatternMatch] Add matcher for G_PTR_ADD

Add a matcher which recognizes G_PTR_ADD and add a test.

Differential Revision: https://reviews.llvm.org/D94348

[Sanitizer][Darwin] Fix test for macOS 11+ point releases

This test wrongly asserted that the minor version is always 0 when
running on macOS 11 and above.

[NFC] Disallow unused prefixes under MC/AMDGPU

This patches remaining tests, and patches lit.local.cfg to block future
such cases (until we flip FileCheck's flag)

Differential Revision: https://reviews.llvm.org/D94556

Delete unused function (was breaking the -Werror build)

[AMDGPU] Add _e64 suffix to VOP3 Insts

Previously, instructions which could be
expressed as VOP3 in addition to another
encoding had a _e64 suffix on the tablegen
record name, while those
only available as VOP3 did not. With this
patch, all VOP3s will have the _e64 suffix.
The assembly does not change, only  the mir.

Reviewed By: foad

Differential Revision: https://reviews.llvm.org/D94341

Change-Id: Ia8ec8890d47f8f94bbbdac43745b4e9dd2b03423

[libc] add isascii and toascii implementations

adding both at once since these are trivial functions.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D94558

[libc][NFC] Use more specific comparison macros in LdExpTest.h.

[LangRef] State that a nocapture pointer cannot be returned

This is a small patch stating that a nocapture pointer cannot be returned.

Discussed in D93189.

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D94386