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jemalloc requires a working MAP_EXCL. Ensure that no page is double mapped when specified. In addition, use guest_range_valid_untagged to test for valid ranges of pages rather than an incomplete inlined version of the test that might be wrong. Signed-off-by: Kyle Evans <kevans@FreeBSD.org> Signed-off-by: Warner Losh <imp@bsdimp.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>