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Instead of requiring every BPF policy to check IsValidSyscallNumber()
and return a fixed value when it's true, provide an alternative entry
point and guarantee that EvaluateSyscall() will only be called for
valid syscall numbers.

Review URL: https://codereview.chromium.org/293463002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271256 0039d316-1c4b-4281-b951-d872f2087c98