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[lld-macho] Collect S_ATTR_LIVE_SUPPORT sections with the markLive roots

Co-Authored-By: Claude Opus 5.5 <noreply at anthropic.com>
Claude-Session: https://claude.ai/code/session_0151E9Zq69e8fCB8jwD3kGLe

clang: Don't set redundant intrinsic callsite attributes (#242158)

Clang has a bad habit of spamming unnecessary callsite attributes that
are redundant with the function declaration. Fix one common source on
emitted intrinsics.

Co-authored-by: Claude Opus 5.5 <noreply at anthropic.com>

tcp: count only the SACK blocks that fit in tcp_maxseg()

tcp_addoptions() sends only the SACK blocks that fit in TCP_MAXOLEN.
tcp_maxseg() counted every pending block and clamped the total, so
without timestamps and with five or more blocks pending it came out 4
bytes below the segment tcp_output() sends.  Limited transmit after an
RTO then sent one full segment and failed the "sent too much" KASSERT.

PR:             282605

Approved by:    adrian (mentor)
Signed-off-by:  Nick Price <nprice at FreeBSD.org>
Reviewed by:    tuexen, glebius, adrian
Differential Revision:  https://reviews.freebsd.org/D60460

[bazel] Add subpackage for libc/src/__support/OSUtil

[bazel] Add subpackage for libc/src/__support/macros

[bazel] Add subpackage for libc/src/__support

[bazel] Add subpackage for libc/src/__support/CPP

[bazel] Add subpackage for libc/src/__support/StringUtil

[bazel] Add subpackage for libc/src/__support/OSUtil/linux/syscall_wrappers

[bazel] Add subpackage for libc/src/stdbit

Part of https://github.com/llvm/llvm-project/issues/238076.

[bazel] Add subpackage for libc/src/__support/net

[bazel] Update libc rules to avoid local variables

[bazel] Add subpackage for libc/src/__support/printf_core

[bazel] Add subpackage for libc/src/__support/time

[bazel] Add subpackage for libc/src/__support/File

[bazel] Add subpackage for libc/src/math

Part of https://github.com/llvm/llvm-project/issues/238076.

[bazel] Add subpackage for libc/src/__support/threads

[bazel] Rename targets to use the __support_{pkg}_{name} convention

[bazel] Add subpackage for libc/src/__support/math

[bazel] Add subpackage for libc/src/__support/macros/properties

[bazel] Add subpackage for libc/src/__support/wchar

[bazel] Add subpackage for libc/src/__support/FPUtil

[bazel] Add subpackage for libc/src/__support/fixed_point

IR: Make AttributeList::hasAttributeAtIndex and hasAttrSomewhere inline

Check the attributes available at any index through AttributeListImplBase.

CTMark instructions:u: O3 -0.22%, ThinLTO -0.29%.

Co-authored-by: Claude Opus 5.5 <noreply at anthropic.com>

IR: Make AttributeList::getAttributes inline

Store the attribute sets and their count in AttributeListImplBase.

CTMark instructions:u: O3 -0.16%, ThinLTO -0.14%.

Co-authored-by: Claude Opus 5.5 <noreply at anthropic.com>

IR: Don't store the attribute set array pointer in AttributeListImplBase

Compute the address of the trailing attribute sets from the base instead
of loading a stored pointer, saving a dependent load on every
AttributeList query. Move AvailableSomewhereAttrs into the base so the
attribute sets directly follow it.

CTMark instructions:u, geomean:
  clang-23 built:            O3 -0.00%, ThinLTO -0.02%
  ThinLTO trunk clang built: O3 -0.01%

Co-authored-by: Claude Opus 5.5 <noreply at anthropic.com>

IR: Make AttributeList::hasAttributeAtIndex and hasAttrSomewhere inline

Store the attributes available at any index in AttributeListImplBase.

CTMark instructions:u: O3 -0.22%, ThinLTO -0.29%.

Co-authored-by: Claude Opus 5.5 <noreply at anthropic.com>

IR: Make AttributeList::getAttributes inline

Store the attribute sets and their count in AttributeListImplBase.

CTMark instructions:u: O3 -0.16%, ThinLTO -0.14%.

Co-authored-by: Claude Opus 5.5 <noreply at anthropic.com>

IR: Make AttributeSet::hasAttribute and AttributeList::hasFnAttr inline (#241670)

Move the bitsets of available enum attributes into public base classes of 
AttributeSetNode and AttributeListImpl, so that these frequent queries
can be inline.

CTMark instructions:u: O3 -0.22%, ThinLTO -0.34%.

Co-authored-by: Claude Opus 5.5 <noreply at anthropic.com>

[RISCV][P-ext] Update pm2wadd(a) ISD opcodes to use 2 i32 values to represent i64. (#241997)

Previously, we were packing the 2 i32 values into a v2i32, but that is
inconsistent with other ISD opcodes.

Assisted-by: Claude