Write output for temporary compilation into a file with a unique name

Write output for temporary compilation into a file with a unique name
so that when the runtime loads the file, the microcode will not cache
the blocks under the same name for each compilation, which caused odd
effects such as

(scode-eval (compile-scode 1) #f)
;Value: 1

(scode-eval (compile-scode 2) #f)
;Value: 1