Remove unused directly includes and forward declarations in ADT and
Analysis headers.

Currently, to use PSI->isFunctionHotInCallGraph, we first need to
calculate BPI->BFI, which is expensive. Instead, we can implement this
directly with MBFI. Also as @wenlei mentioned in another patch review,
that MachineSizeOpts already has isFunctionColdInCallGraph,
isFunctionHotInCallGraphNthPercentile, etc implemented. These can be
refactored and so they can be reused across MachineFunctionSplitting
and MachineSizeOpts passes.

This CL does this - it refactors out those internal static functions
into PSI as templated functions, so they can be accessed easily.

Differential Revision: https://reviews.llvm.org/D153927

This reverts commit 4d8cf2ae6804e0d3f2b668dbec0f5c1983358328.

There is a library layering violation. LLVMAnalysis cannot depend on LLVMCodeGen.

```
llvm/include/llvm/Analysis/ProfileSummaryInfo.h:19:10: fatal error: 'llvm/CodeGen/MachineFunction.h' file not found
   19 | #include "llvm/CodeGen/MachineFunction.h"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```

In D152399, we calculate BPI->BFI in MachineFunctionSplit pass just to
use PSI->isFunctionHotInCallGraph, which is expensive. Instead, we can
implement this directly with MBFI.

Reviewer mentioned in the comment, that machine_size_opts already has
isFunctionColdInCallGraph, isFunctionHotInCallGraphNthPercentile, etc
implemented. These can be refactored and reused across MFS and machine
size opts.

This CL does this - it refactors out those internal static functions
into PSI as templated functions, so they can be accessed easily.

Differential Revision: https://reviews.llvm.org/D153927

This reverts commit c3e33720403c010e140c17313eeefd9a0f25887a.

This has broken quite a few buildbots.

In D152399, we calculate BPI->BFI in MachineFunctionSplit pass just to
use PSI->isFunctionHotInCallGraph, which is expensive. Instead, we can
implement this directly with MBFI.

Reviewer mentioned in the comment, that machine_size_opts already has
isFunctionColdInCallGraph, isFunctionHotInCallGraphNthPercentile, etc
implemented. These can be refactored and reused across MFS and machine
size opts.

This CL does this - it refactors out those internal static functions
into PSI as templated functions, so they can be accessed easily.

Differential Revision: https://reviews.llvm.org/D152758

Some cl::ZeroOrMore were added to avoid the `may only occur zero or one times!`
error. More were added due to cargo cult. Since the error has been removed,
cl::ZeroOrMore is unneeded.

Also remove cl::init(false) while touching the lines.

The revert was a misfire.

Remove the temporary flag PGSOIRPassOrTestOnly and the guard code which was used
for the staged rollout. This is a cleanup (NFC) as it's now false by default.

Differential Revision: https://reviews.llvm.org/D84057