llvm_tools: fix yapf warnings

This CL applies fixes automatically generated by yapf during presubmit
hook as well as a few manual fixes:
 * Removing erroneous `verbose` argument from call to RunTryJobs
 * Replacing / with parenthsis for long lines
 * Shortened some variable names to fix lines that were too long

BUG=None
TEST=rerean unit tests

Change-Id: Ic6ed4bb74f067dd5c67991481caf75d8829bf86e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/3248930
Tested-by: Ryan Beltran <ryanbeltran@chromium.org>
Auto-Submit: Ryan Beltran <ryanbeltran@chromium.org>
Commit-Queue: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
4 files changed