refactor(es/ast): Avoid transmute in impl of Hash for Number (#…

…7771)

**Description:**

[`f64::to_bits()`](https://doc.rust-lang.org/stable/std/primitive.f64.html#method.to_bits) does the same thing.

crates/swc_ecma_ast/src/lit.rs

@@ -2,7 +2,6 @@ use std::{
     borrow::Cow,
     fmt::{self, Display, Formatter},
     hash::{Hash, Hasher},
-    mem,
 };
 
 use num_bigint::BigInt as BigIntValue;
@@ -353,7 +352,7 @@ impl EqIgnoreSpan for Number {
 impl Hash for Number {
     fn hash<H: Hasher>(&self, state: &mut H) {
         fn integer_decode(val: f64) -> (u64, i16, i8) {
-            let bits: u64 = unsafe { mem::transmute(val) };
+            let bits: u64 = val.to_bits();
             let sign: i8 = if bits >> 63 == 0 { 1 } else { -1 };
             let mut exponent: i16 = ((bits >> 52) & 0x7ff) as i16;
             let mantissa = if exponent == 0 {