[CIR] Upstream `AddressSpace` conversions support (#161212) related: #160386 Add support for address space conversions in CIR. - Added `createAddrSpaceCast` methods to `CIRBaseBuilderTy` to handle address space conversions - Implemented address space conversion handling in `emitCastLValue` and `VisitCastExpr` - Added `performAddrSpaceCast` method to `TargetCIRGenInfo` for target-specific address space casting - Added `getLangTempAllocaAddressSpace` to `CIRGenModule` to get the language-specific address space for temporary allocations - Added a test file `address-space-conversion.cpp` to verify address space conversion functionality
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