[PassTimingInfo] Stop double (or worse) counting passes/analyses

If we nest timers, we end up double counting anything nested.

The most egregious is ModuleInlinerWrapperPass/DevirtSCCRepeatedPass showing up as >20% of the total time when they're just wrappers.

Analyses also end up getting counted multiple times because they're nested inside wrappers and passes.

Ignore ModuleInlinerWrapperPass/DevirtSCCRepeatedPass and put analyses into their own TimerGroup.

Reviewed By: asbirlea

Differential Revision: https://reviews.llvm.org/D135219