These are identified by misc-include-cleaner.  I've filtered out those
that break builds.  Also, I'm staying away from llvm-config.h,
config.h, and Compiler.h, which likely cause platform- or
compiler-specific build failures.

The object file format specific derived classes are used in context
where the type is statically known. We don't use isa/dyn_cast and we
want to eliminate MCSymbol::Kind in the base class.

The object file format specific derived classes are used in context
where the type is statically known. We don't use isa/dyn_cast and we
want to eliminate MCSymbol::Kind in the base class.

There might be more than one relocations at an offset with composed
relocations or .reloc directive. llvm::sort output is unstable, and if
EXPENSIVE_CHECKS, also undeterministic, causing
MC/Mips/reloc-directive.s to fail.

Prepare for removing MipsMCExpr. Adopt the newer naming convention (S_)
used by AMDGPU/WebAssembly/VE/M68k/PowerPC/LoongArch/RISCV.

Replace MCSymbol argument with MCValue::AddSym. The minor difference in
.weakref handling is negligible, as our implementation may not fully
align with GAS, and .weakref is not used in practice.

Additionally, swap MCFixup/MCValue order to match addReloc/recordRelocation.

Prepare for removing MCContext from getRelocType functions.