compiler_builtins-v0.1.160

Other

• Change compiler-builtins to edition 2024
• Remove unneeded C symbols
• Reuse libm's Caat and CastFrom in compiler-builtins
• Reuse MinInt and Int from libm in compiler-builtins
• Update CmpResult to use a pointer-sized return type
• Enable __powitf2 on MSVC
• Fix i256::MAX
• Add a note saying why we use frintx rather than frintn
• Typo in README.md
• Clean up unused files