Remove libm-bench

This has been superseded by the benchmarks in `libm-test`.

Author: tgross35

Cargo.toml

@@ -38,7 +38,6 @@ force-soft-floats = []
 resolver = "2"
 members = [
   "crates/compiler-builtins-smoke-test",
-  "crates/libm-bench",
   "crates/libm-macros",
   "crates/libm-test",
   "crates/musl-math-sys",