c++: ICE with templated sizeof(E1) / sizeof(E2) [PR114888]

c++: ICE with templated sizeof(E1) / sizeof(E2) [PR114888]

In the sizeof / sizeof operator expression handling we're missing
a dependence check for the second operand.

	PR c++/114888

gcc/cp/ChangeLog:

	* typeck.cc (cp_build_binary_op) <case *_DIV_*>: Add missing
	dependence check for the second sizeof operand.

gcc/testsuite/ChangeLog:

	* g++.dg/template/sizeof19.C: New test.

Reviewed-by: Jason Merrill <jason@redhat.com>