MSVC's implementation of the STL allocates memory even for an empty
vector. Since we're using a custom thread-local allocator, it should
be initialized before any STL member containers get initialized.

BUG=swiftshader:7

Change-Id: I4bd977e7ee8eb87006fe08b051cbcfc9bc62342b
Reviewed-on: https://chromium-review.googlesource.com/381531Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Jim Stichnoth <stichnot@chromium.org>