[CodeGen] Prune headers and move code out of line for build efficiency, NFC (#135622) I noticed these destructors taking time with -ftime-trace and moved some of them for minor build efficiency improvements. The main impact of moving destructors out of line is that it avoids requiring container fields containing other types from being complete, i.e. one can have uptr<T> or vector<T> as a field with an incomplete type T, and that means we can reduce transitive includes, as with LegalizerInfo.h. Move expensive getDebugOperandsForReg template out-of-line. The std::function instantiation shows up in time trace even if you don't use the function.
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