Restore CodeGen/LowLevelType from `Support` This is rework of; - D30046 (LLT) Since I have introduced `llvm-min-tblgen` as D146352, `llvm-tblgen` may depend on `CodeGen`. `LowLevlType.h` originally belonged to `CodeGen`. Almost all userse are still under `CodeGen` or `Target`. I think `CodeGen` is the right place to put `LowLevelType.h`. `MachineValueType.h` may be moved as well. (later, D149024) I have made many modules depend on `CodeGen`. It is consistent but inefficient. It will be split out later, D148769 Besides, I had to isolate MVT and LLT in modmap, since `llvm::PredicateInfo` clashes between `TableGen/CodeGenSchedule.h` and `Transforms/Utils/PredicateInfo.h`. (I think better to introduce namespace llvm::TableGen) Depends on D145937, D146352, and D148768. Differential Revision: https://reviews.llvm.org/D148767
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