std::unsafe: minor optimization for the StrFromBytes function

std/unsafe/conv.jule

@@ -55,16 +55,7 @@ fn BytesStr(b: []byte): str {
 }
 
 // Same as [BytesStr] but keeps garbage collection.
-fn StrFromBytes(b: []byte): str {
-    s := BytesStr(b)
-    unsafe {
-        if integ::Emit[bool]("{}.data.ref != {}", b, nil) {
-            integ::Emit("{}.buffer.ref = {}.data.ref", s, b)
-            integ::Emit("{}.buffer.add_ref()", s)
-        }
-    }
-    ret s
-}
+fn StrFromBytes(b: []byte): str { ret unsafe { *(*str)(&b) } }
 
 // Same as [StrBytes] but keeps garbage collection.
 fn BytesFromStr(s: str): []byte {