Restore CodeGen/MachineValueType.h from `Support`

[chapuni]

Summary

This is rework of;

• rG13e77db2df94 (r328395; MVT)

Since LowLevelType.h has been restored to CodeGen, MachinveValueType.h
can be restored as well.

Depends on D148767

[chapuni]

• Rebase and update the desc

[chapuni]

• Update the desc

[chapuni]

• Update the desc

[vzakhari]

Hello @chapuni, the commit breaks MLIR build, because the old path is used e.g. in https://github.com/llvm/llvm-project/blob/main/mlir/tools/mlir-tblgen/LLVMIRIntrinsicGen.cpp
Could you please fix it?

[aaron.ballman]

In D149024#4312654, @vzakhari wrote:

Hello @chapuni, the commit breaks MLIR build, because the old path is used e.g. in https://github.com/llvm/llvm-project/blob/main/mlir/tools/mlir-tblgen/LLVMIRIntrinsicGen.cpp
Could you please fix it?

This broke a lot of bots, not just the MLIR bot, so please fix or revert:
https://lab.llvm.org/buildbot/#/builders/89/builds/40361
https://lab.llvm.org/buildbot/#/builders/175/builds/28771
https://lab.llvm.org/buildbot/#/builders/197/builds/4717
(and others)

[chapuni]

@vzakhari @aaron.ballman
I expect rGea2b79d48d71 will fix. Sorry for the noise.

[vzakhari]

In D149024#4312724, @chapuni wrote:

@vzakhari @aaron.ballman
I expect rGea2b79d48d71 will fix. Sorry for the noise.

Thank you!

[aaron.ballman]

In D149024#4312724, @chapuni wrote:

@vzakhari @aaron.ballman
I expect rGea2b79d48d71 will fix. Sorry for the noise.

Thank you, that seemed to fix the MLIR issues, though I notice one of the bots has a different kind of issue that is probably unrelated to your changes: https://lab.llvm.org/buildbot/#/builders/197/builds/4720/steps/7/logs/FAIL__LLVM__sme-aarch64-svcount_ll