Strict compilation requires symbols used in template functions to have
been declared, which will be enforced in future compilers.

Bug swiftshader:103

Change-Id: Ibfc05011b1a2938e958dfacf6792477362699dc6
Reviewed-on: https://swiftshader-review.googlesource.com/18448Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>