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Currently, base::CPU::GuessCoreTypes() is called in multiple places and
executes the same code multiple times, even though the result is
constant. There's already some static caching in different places.

This patch moves the static caching into base::CPU::GuessCoreTypes()
and renames it to base::CPU::GetGuessedCoreTypes().

Bug: 1081760
Change-Id: Ifaff01cc19abc48a36d5fe19bc4cb9a9cfa4fd24
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2463309
Commit-Queue: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816122}