Don't auto-cluster must-be-constant ops with side effects.

Clustering must-be-constant side effecting ops is a problem because we can't
constant fold these even with constant inputs.

This CL is organized as follows:

 - tf2xla/const_analysis can now report not just the arg indices of
   must-be-constant values, but also their node ids.
 - jit/mark_for_compilation_pass consults const_analysis and avoids clustering
   side effecting ops that must be constant.

PiperOrigin-RevId: 209996730