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Currently, tcmalloc is not supported on loongson, and the build
failed with use tcmalloc. This CL adds support for tcmalloc on
loongson, and resolves many compiler errors, bugs when test
base_unittests on loongosn.

Bug: 799810

R= wfh@chromium.org, thakis@chromium.org

Change-Id: I68bea09334cb9af02d083a24a94654aaf6c884c8
Reviewed-on: https://chromium-review.googlesource.com/853695Reviewed-by: Will Harris <wfh@chromium.org>
Commit-Queue: 汪 清 <wangqing-hf@loongson.cn>
Cr-Commit-Position: refs/heads/master@{#533192}