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[CodeGen][CGObjCGNU] Fix assertion failure for negative ivar offsets (#215753)

Ivars can have negative offsets, for example if an ivar from a derived
class is placed inside the super classes padding.
Currently, the offset is computed as an `uint64_t`, which results in an
integer wraparound for negative offsets.
The wrapped offset is then written to a global value to be parsed by
libobjc2. When libobjc2 reads the value as a truncated signed `int`, it
is again implicitly converted correct negative number. However, with
assertions enabled we hit an assertion failure in LLVM when creating the
global value. See https://godbolt.org/z/Yb7cvWTqP.

convert ZA header

convert PAC

convert SVE header

convert TLS

convert ZT

convert SVE

convert MTE

convert GCS

convert fpmr

convert ZA

convert POE

[lldb][AArch64][Linux] Add function to get register buffers

Replaces Get<set>Buffer methods.

convert POE

convert gcs

convert FPMR

convert ZT

convert TLS

convert ZA buffer

convert MTE

[lldb][AArch64][Linux] Add function to get size of register set

Another one to be used in a generic read/write function later.
Replaces all the Get<thing>Size() methods.

remove sve buffer size

replace sve header

replace PAC

replace za_header

convert uses of constants

SVE -> SVE_HEADER

remove GetSVERegSet

[lldb][AArch64][Linux] Add function to lookup ptrace set number

This will be part of a set of RegisterSetType -> thing lookup
functions later used to implement generic read and write functions.

This replaces GetSVERegSet and any other direct uses of ptrace
set numbers. Apart from a couple where we are trying to detect
SVE and SME regardless of what the current mode is.

[clang-tidy] Fix `DefaultHungarianPrefix` for incomplete classes in `readability-identifier-naming` (#215734)

Treat `DefaultHungarianPrefix` as a valid
`readability-identifier-naming` option and check that a class has a
definition before calling `isAbstract()` to compute its Hungarian
prefix.

Closes #215732