util,tests: Updated compiler-tests to support paths with spaces
util,tests: Updated compiler-tests to support paths with spaces

This script was failing if the gem5 directory path contained a space.
E.g: `/home/bobbys home/gem5`. This script has thereby been improved to
handle this.

Change-Id: Id56ff5a0e9aa31eef14de2111b040f7f2b0b286c
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/31534
Reviewed-by: Daniel Carvalho <91779fc734d358d9575ec4910de29bfcbcaf1b22@yahoo.com.br>
Maintainer: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5