c++: static memfn from non-dependent base [PR101078]

c++: static memfn from non-dependent base [PR101078]

After my patch for PR91706, or before that with the qualified call,
tsubst_baselink returned a BASELINK with BASELINK_BINFO indicating a base of
a still-dependent derived class.  We need to look up the relevant base binfo
in the substituted class.

	PR c++/101078

gcc/cp/ChangeLog:

	* pt.c (tsubst_baselink): Update binfos in non-dependent case.

gcc/testsuite/ChangeLog:

	* g++.dg/template/access39.C: New test.