[libc-commits] [libc] [libc][cmake] pass -mthumb for thumb triples (PR #96550)

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enh-google wrote:

> Ok, I can change Android's bp file to use `-marm` (perhaps worth benchmarking, but "eh 32b bit").

like i said, the _claim_ is that thumb makes performance _worse_ (but keeps binaries smaller):

https://source.corp.google.com/search?q=file:bp$%20instruction_set%5C:&sq=repo:android%2Fplatform%2Fsuperproject%2Fmain%20b:main%20-file:prebuilts%2Fvndk%2F%20-file:prebuilts%2Fruntime%2F

go/mokey#ordering-a-mokey if you want a 32-bit device.

https://github.com/llvm/llvm-project/pull/96550