[MC] Remove unused includes (NFC) (#116317)

Identified with misc-include-cleaner.

[AArch64][MachO] Add ptrauth ABI version to arm64e cpusubtype. (#104650)

In a mach_header, the cpusubtype is a 32-bit field, but it's split in 2
subfields:
- the low 24 bits containing the cpu sub

[AArch64][MachO] Add ptrauth ABI version to arm64e cpusubtype. (#104650)

In a mach_header, the cpusubtype is a 32-bit field, but it's split in 2
subfields:
- the low 24 bits containing the cpu subtype proper, (e.g.,
CPU_SUBTYPE_ARM64E 2)
- the high 8 bits containing a capability field used for additional
feature flags.

Notably, it's only the subtype subfield that participates in fat file
slice discrimination: the caps are ignored.

arm64e uses the caps subfield to encode a ptrauth ABI version:
- 0x80 (CPU_SUBTYPE_PTRAUTH_ABI) denotes a versioned binary
- 0x40 denotes a kernel-ABI binary
- 0x00-0x0F holds the ptrauth ABI version

This teaches the basic obj tools to decode that (or ignore it when
unneeded).

It also teaches the MachO writer to default to emitting versioned
binaries, but with a version of 0 (and without the kernel ABI flag).

Modern arm64e requires versioned binaries: a binary with 0x00 caps in
cpusubtype is now rejected by the linker and everything after. We can
live without the sophistication of specifying the version and kernel ABI
for now.

Co-authored-by: Francis Visoiu Mistrih <francisvm@apple.com>

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MC: Inline createMachObjectWriter into MCAsmBackend

We could do the same to COFF once WinCOFFObjectWriter is cleaned up
(#100303).

MCAssembler: Move SubsectionsViaSymbols; to MCObjectWriter

MCAssembler: Move LinkerOptions to MachObjectWriter

MCAssembler: Move CGProfile to MCObjectWriter

[MC] Move VersionInfo to MachObjectWriter

[MC] Move LOHContainer to MachObjectwriter

[MC] Move isPrivateExtern to MCSymbolMachO

[MachO] Detect overflow in section offset. (#98685)

The section offset field is only 32 bits; if the computed section offset
is larger, make sure we don't emit a corrupt object file.

MCAssembler: Remove unneeded non-const iterators for Sections and misleading size()

The pointers cannot be mutated even if the dereferenced MCSection can.

[MC] Move MCAssembler::DataRegions to MachObjectWriter

and make some cleanup.

[MC] Move MCAssembler::IndirectSymbols to MachObjectWriter

[MC,MachO] Simplify IndirectSybols

[MC] Move MCAssembler::isSymbolLinkerVisible to MCSymbolMachO

Move MCSection::LayoutOrder to MCSectionMachO

This variable is similar to `Ordinal` but only used for Mach-O to place
zerofill sections ("virtual sections" in MC term) after non-zerofill ones.

Foll

Move MCSection::LayoutOrder to MCSectionMachO

This variable is similar to `Ordinal` but only used for Mach-O to place
zerofill sections ("virtual sections" in MC term) after non-zerofill ones.

Follow-up to 7840c0066837797cdeb62aab63044b964aa7f372.

Pull Request: https://github.com/llvm/llvm-project/pull/97474

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MachObjectWriter: replace the MCAsmLayout parameter with MCAssembler

MCExpr::evaluateAsRelocatable: replace the MCAsmLayout parameter with MCAssembler

Continue the MCAsmLayout removal work started by 67957a45ee1ec42ae1671cdbfa0d73127346cc95.

MachObjectWrite::reset: clear SectionAddress and SectionOrder

Otherwise llvm/test/MC/MachO/empty-twice.ll might fail.

Fixes: 7840c0066837797cdeb62aab63044b964aa7f372 ("[MC] Move MCAsmLayout::Sectio

MachObjectWrite::reset: clear SectionAddress and SectionOrder

Otherwise llvm/test/MC/MachO/empty-twice.ll might fail.

Fixes: 7840c0066837797cdeb62aab63044b964aa7f372 ("[MC] Move MCAsmLayout::SectionOrder to MachObjectWriter::SectionOrder")

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[MC] Move MCAsmLayout::SectionOrder to MachObjectWriter::SectionOrder

Follow-up to 2c1fb411ce3aed148a278660d215e0f88ff9b9be.

SectionOrder is Mach-O specific to place zerofill sections after
non-zer

[MC] Move MCAsmLayout::SectionOrder to MachObjectWriter::SectionOrder

Follow-up to 2c1fb411ce3aed148a278660d215e0f88ff9b9be.

SectionOrder is Mach-O specific to place zerofill sections after
non-zerofill sections in the object writer.

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[MC] Remove MCAsmLayout::{getSymbolOffset,getBaseSymbol}

The MCAsmLayout::* forwarders added by
67957a45ee1ec42ae1671cdbfa0d73127346cc95 have all been removed.

[MC] Remove MCAsmLayout::{getSectionFileSize,getSectionAddressSize}

[MC] Remove MCAsmLayout::getFragmentAddress

[MC] Remove the MCAsmLayout parameter from MCObjectWriter::executePostLayoutBinding

[MC] Remove the MCAsmLayout parameter from MCObjectWriter::{writeObject,writeSectionData}