Merge Develop

[PhilippvK]

Changes:

• Initial support for LLVM19 (backwards compatible to LLVM18)
• Passes:
  • add detect_loops and detect_calls
  • improve function inlining pass
• Config:
  • Allow conditional patches (e.g. via onlyif: settings.llvm.state.version.major == 19)
• Intrinsics/Builtins:
  • Unify naming
  • Fix whitespace issues (when generating more than one intrinsic)
  • Add InstrinsicArg.signed and InstrinsicSetting.ret_signed
• Dependencies: select coredsl2llvm ref automatically based on llvm version
• CCache: more flexible configuration via settings (+ automatic lookup)
• Attributes:
  • improve SKIP_PATTERN_GEN handling
  • introduce LLVM_INSTR
• Demos:
  • Expose LLVM_URL and LLVM_REF
• Core-V Example:
  • Add more tests
  • Fix some tests
  • Define most Core-V intrinsics
• Minor fixes
  • Fix grammar
  • Fix string attributes in writer
  • Fix typos
  • Error handling in backends (do not generate empty patches)