TargetInstrInfo now directly holds a reference to TargetRegisterInfo
and does not need TRI passed in anywhere.

In this commit:
  (1) Added new pass manager support for `ReachingDefAnalysis`.
  (2) Added printer pass.
  (3) Make old pass manager use `ReachingDefInfoWrapperPass`

This is a low level utility to parse the MCInstrInfo and should
not depend on the state of the function.

BreakFalseDeps picks the best register for undef operands if
instructions have false dependency. The problem is if the instruction is
close to the beginning of the function, ReachingDefAnalysis is over
optimism to the unused registers, which results in collision with
registers just defined in the caller.

This patch changes the selection of undef register in an reverse order,
which reduces the probability of register collisions between caller and
callee. It brings improvement in some of our internal benchmarks with
negligible effect on other benchmarks.

Add per-property has<Prop>/set<Prop>/reset<Prop> functions to
MachineFunctionProperties.

Reviewed By: foad

Differential Revision: https://reviews.llvm.org/D152098

Differential Revision: https://reviews.llvm.org/D151424

The pass uses ReachingDefAnalysis which has no information about
instructions in dead blocks.
So do not process them.

Reviewed By: pengfei
Differential Revision: https://reviews.llvm.org/D148329

This change initializes the members TSI, LI, DT, PSI, and ORE pointer feilds of the SelectOptimize class to nullptr.

Reviewed By: LuoYuanke

Differential Revision: https://reviews.llvm.org/D148303