This includes the following API changes:

* New BLAKE3 API:
  * Structs:
    * `llvm_blake3_chunk_state`
    * `llvm_blake3_hasher`.
  * Functions:
    * `llvm_blake3_version`
    * `llvm_blake3_hasher_init`
    * `llvm_blake3_hasher_init_keyed`
    * `llvm_blake3_hasher_init_derive_key`
    * `llvm_blake3_hasher_init_derive_key_raw`
    * `llvm_blake3_hasher_update`
    * `llvm_blake3_hasher_finalize`
    * `llvm_blake3_hasher_finalize_seek`
    * `llvm_blake3_hasher_reset`
* New functionns for interaction with opaque pointers:
  * `LLVMContextSetOpaquePointers`
  * `LLVMPointerTypeIsOpaque`
  * `LLVMPointerTypeInContext`
* Change of signature of `LLVMOpInfoCallback` function type:
  * New arguments `OpSize` and `InstSize`.
  * Removal of `Size` argument.
* New RMW atomic operations:
  * `LLVMAtomicRMWBinOpFMax`
  * `LLVMAtomicRMWBinOpFMin`
* New LLVM binary type:
  * `LLVMBinaryTypeOffload` - offloading fatbinary.
* New JIT symbol generic flag:
  * `LLVMJITSymbolGenericFlagsNone`
* Renaming of `LLVMJITCSymbolMapPair` to `LLVMOrcCSymbolMapPair`.
* New struct and type for JITDylib search order:
  * `LLVMOrcCJITDylibSearchOrderElement`
  * `LLVMOrcCJITDylibSearchOrder`
* New ORC function types:
  * `LLVMOrcDisposeCAPIDefinitionGeneratorFunction`
  * `LLVMOrcExecutionSessionLookupHandleResultFunction`
* New ORC functions:
  * `LLVMOrcExecutionSessionLookup`
  * `LLVMOrcLookupStateContinueLookup`
* Change of signature of `LLVMOrcCreateCustomCAPIDefinitionGenerator`:
  * New `Dispose` argument.
* Removal of `coroutines` header, which included functions:
  * `LLVMAddCoroEarlyPass`
  * `LLVMAddCoroSplitPass`
  * `LLVMAddCoroElidePass`
  * `LLVMAddCoroCleanupPass`
  * `LLVMPassManagerBuilderAddCoroutinePassesToExtensionPoints`
* Removal of IPO functions:
  * `LLVMAddArgumentPromotionPass`
  * `LLVMPassManagerBuilderPopulateLTOPassManager`
* Removal of one calar function:
  * `LLVMAddLoopUnswitchPass`
* New `LLVMGetCastOpcode` function to aid users of `LLVMBuildCast` in
  resolving the best cast operation given a source value and
  destination type. This function is a direct wrapper of
  `CastInst::getCastOpcode`.
* New `LLVMGetAggregateElement` function as a wrapper for
  `Constant::getAggregateElement`, which can be used to fetch an element
  of a constant struct, array or vector, independently of the underlying
  representation. The `LLVMGetElementAsConstant` function is deprecated
  in favor of the new function, which works on all constant aggregates,
  rather than only instances of `ConstantDataSequential`.
* Removal of the following functions for creating constant expressions,
  because the underlying constant expressions are nno longer supported.
  Instead, an instruction should be created using the `LLVMBuildXYZ`
  APIs, which will constant fold the operands if possible and create an
  instruction otherwise:
  * `LLVMConstExtractValue`
  * `LLVMConstInsertValue`
  * `LLVMConstUDiv`
  * `LLVMConstExactUDiv`
  * `LLVMConstSDiv`
  * `LLVMConstExactSDiv`
  * `LLVMConstURem`
  * `LLVMConstSRem`
  * `LLVMConstFAdd`
  * `LLVMConstFSub`
  * `LLVMConstFMul`
  * `LLVMConstFDiv`
  * `LLVMConstFRem`
* New `LLVMDeleteInstruction` function which allows deleting
  instructions that are not inserted into a basic block.

Signed-off-by: Michal Rostecki <vadorovsky@gmail.com>