Add duplicate Valgrind tasks on QuadroP400.

Valgrind 3.13.0 only supports up to AVX2, so I used SK_CPU_LIMIT_SSE41
to avoid failing with "Unrecognised instruction." (The existing Valgrind
tasks run on a ShuttleA machine, whose CPU only supports AVX.)

Needed to enable verbose output on all Valgrind tasks to avoid Swarming
I/O timeout. Opportunistically removed verbose output for Linux Intel
bots that are no longer failing.

Bug: skia:6881
Change-Id: I2ffa6efe901c97bd2e0bbc9b26632aafbb3cf9a6
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/31143
Commit-Queue: Ben Wagner <benjaminwagner@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
4 files changed