switch from target_family to target_arch

Author: RustyYato

library/core/src/num/f32.rs

@@ -1022,7 +1022,8 @@ impl f32 {
                     target_arch = "aarch64",
                     all(any(target_arch="riscv32", target_arch= "riscv64"), target_feature="d"),
                     all(target_arch = "arm", target_feature="vfp2"),
-                    target_family = "wasm",
+                    target_arch = "wasm32",
+                    target_arch = "wasm64",
                 ))] {
                 // whitelist the faster implementation to targets that have known good 64-bit float
                 // implementations. Falling back to the branchy code on targets that don't have