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As suggested by @alexcrichton in rust-lang/rust#56066 (comment) and rust-lang/rust#56066 (comment).
This also adds f32 versions of acosf, asinf, atan2f, atanf, cbrtf, coshf, expm1f, fdimf, hypotf, log1pf, sinhf, tanf, tanhf to the wasm target. These have recently been implemented. With this change, the conversion functions in https://github.com/rust-lang/rust/blob/b74215a/src/libstd/sys/wasm/cmath.rs#L11-L75 are obsolete and can be swapped out for their f32 versions. I have included that change in my SGX PR for std which updates the compiler-builtins submodule.