llvm-project

dfc1f2b2 - [CIR][ABI][NFC] Update ABI lowering design doc with implementation experience (#188617)

[CIR][ABI][NFC] Update ABI lowering design doc with implementation experience (#188617) Three documentation improvements based on implementation experience: - Improve Section 4.4 flow diagram: replace flat step-by-step diagram with layered version showing which architectural layer (MLIR adapter, LLVM ABI library, dialect-specific) owns each step. - Note dialect-aware type mapping: dialects with custom types (e.g. cir::IntType is not mlir::IntegerType) may need dialect-aware mapping alongside the generic mapper to preserve signedness, pointer identity, and record field structure. - Update ABIRewriteContext interface: describe the actual two-method interface (rewriteFunctionDefinition, rewriteCallSite) instead of the 15-20 fine-grained methods originally proposed. Made with [Cursor](https://cursor.com)