[run-tests.py]
- adding more detailed information about the flags
- show more detailed error message on failing Popen commands

BUG=

Review URL: https://codereview.chromium.org/1369343002

Cr-Commit-Position: refs/heads/master@{#30997}

Also use again the taskkill method, recently removed in
https://codereview.chromium.org/1156133006/

BUG=chromium:485932
LOG=n
TBR=jkummerow@chromium.org
NOTREECHECKS=true

Review URL: https://codereview.chromium.org/1177903005

Cr-Commit-Position: refs/heads/master@{#29001}

BUG=chromium:485932
LOG=n

Review URL: https://codereview.chromium.org/1134703002

Cr-Commit-Position: refs/heads/master@{#28334}

The new process pool allows adding jobs after testing has been started. It will also allow to restructure building the job queue (in a follow up CL), so that testing can start instantly while the queue is being built.

Also attempts to clean up the keyboard-interrupt logic. Idea: Only catch keyboard interrupt once per process at the outermost level. Use proper "finally" clauses to clean up everywhere where a keyboard interrupt might occur. Never turn named exceptions into none-exceptions using anonymous "raise".

TEST=python -m unittest pool_unittest
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/275093002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21310 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

'make ia32' should not build ia32.optdebug.
'make ia32.clean' should delete ia32.optdebug output.
'make quickcheck' should be terminatable by hitting Ctrl+C just once.

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/106443002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18259 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

R=jkummerow@chromium.org

Review URL: https://chromiumcodereview.appspot.com/11193055

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12770 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

Review URL: https://codereview.chromium.org/10919265

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12583 ce2b1a6d-e550-0410-aec6-3dcde31c8c00