The clobber list "cc" is added to inline assembly to workaround a clang assertion that triggers when building with a clang built with assertions enabled. See bug 53391.
The sqrtl input constraint was changed from f to t to fix compilation errors in gcc. Not that it matters much, it's nearly impossible to build with gcc anyway.
See https://godbolt.org/z/z3bc6a9PM showing functionally same output assembly.