Poor codegen for typed throws

[rauhul]

Description

I implemented an AudioQueueOutputCallback in Swift and observed pretty poor codegen in release mode.

Reproduction

See attached package and compare the C and Swift symbols:

• xx_next_audio_queue_buffer
• xxNextAudioQueueBuffer

optimizer.zip

Expected behavior

Swift should produce nearly (if not actually) identical code for the callback impl

Environment

➜  optimizer 􀫊 :(main 7/28/25) swiftc --version
Apple Swift version 6.2-dev (LLVM 61d7c1adb328ec1, Swift 8803d8359c2cffb)
Target: arm64-apple-macosx26.0
Build config: +assertions

Additional information

No response