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Threadsafe static local variables call into the C runtime on Windows,
which may not be safe in the allocation path (see linked bug). Don't use
them for code which is on this path.

This is using base::LazyInstance. It currently fulfills our needs,
though it is not ideal for a couple reasons:
- Not guaranteed to stay independent from local statics.
- Can allocate in some paths (mostly DCHECK()s)

As such, this is temporary, and we should either make sure that
LazyInstance is suitable, or have a replacement local to PartitionAlloc.

Bug: 1126432
Change-Id: I9cffed6f313c3fb380383a1607f0e6f27397c2a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2401469Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Commit-Queue: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805698}