Toolchain-utils: replace xrange with range on results_cache.py

xrange builtint is replaced by range on Python3. Use range instead of xrange on
results_cache.py.

BUG=chromium:986617

TEST=local tests

Change-Id: I729b12a92b75dbd355fad3012205765a648be538
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/1717449
Tested-by: Jian Cai <jiancai@google.com>
Reviewed-by: George Burgess <gbiv@chromium.org>
1 file changed