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Sanitizers replace the default memory allocator with a custom one.
Unit tests that depend on tcmalloc functionality should not execute in
such cases. These cases are identified by compile macro
MEMORY_TOOL_REPLACES_ALLOCATOR being defined.

While we are at it, don't instantiate the heap profiler when
tcmalloc is not used, as the collector depends on tcmalloc too and it
may result in flakiness. We can enable it for sanitizers once we
remove dependency on tcmalloc.

BUG=chromium:724399,b:70905156

Change-Id: I4ded0301e6ef190b6b45c7f01405005765f3c5e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1636611Reviewed-by: Gabriel Marin <gmx@chromium.org>
Reviewed-by: Alexei Filippov <alph@chromium.org>
Commit-Queue: Gabriel Marin <gmx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664568}