Auto merge of #55303 - alexcrichton:update-libm, r=kennytm
Auto merge of #55303 - alexcrichton:update-libm, r=kennytm

Update compiler-builtins submodule

This commit updates our `compiler-builtins` submodule which brings in at
least a few improvements for intrinsics on wasm32

GBGamer/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,GBGamer/rust,graydon/rust,GBGamer/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,GBGamer/rust,graydon/rust,aidancully/rust