This is part of #70452 that changes the type used for the external
interface of MMO to LocationSize as opposed to uint64_t. This means the
constructors take LocationSize, and convert ~UINT64_C(0) to
LocationSize::beforeOrAfter(). The getSize methods return a
LocationSize.

This allows us to be more precise with unknown sizes, not accidentally
treating them as unsigned values, and in the future should allow us to
add proper scalable vector support but none of that is included in this
patch. It should mostly be an NFC.

Global ISel is still expected to use the underlying LLT as it needs, and
are not expected to see unknown sizes for generic operations. Most of
the changes are hopefully fairly mechanical, adding a lot of getValue()
calls and protecting them with hasValue() where needed.

Rename postprocessDAG to camel case.

Reviewed By: foad

Differential Revision: https://reviews.llvm.org/D146795

Reviewed By: bcain

Differential Revision: https://reviews.llvm.org/D145050

This change moves "DefaultVLIWScheduler" class declaration from
DFAPacketizer.cpp to DFAPacketizer.h.
This is needed because there is a protected class member of
type "DefaultVLIWScheduler*" in "VLIWPacketizerList" class.
The derived classes cannot use this memeber unless declaration
is available to it. More specifically :

// Without this change

```
class HexagonPacketizerList : public VLIWPacketizerList {
  public :
	HexagonPacketizerList() {
	// Below line will cause incomplete class error since
	// declaration was not available through header.
	VLIWScheduler->schedule();
  }
}
```

Reviewed By: kparzysz

Differential Revision: https://reviews.llvm.org/D139767

This is a (fixed) recommit of https://reviews.llvm.org/D121169

after:  1061034926
before: 1063332844

Discourse thread: https://discourse.llvm.org/t/include-what-you-use-include-cleanup
Differential Revision: https://reviews.llvm.org/D121681

This reverts commit 7f230feeeac8a67b335f52bd2e900a05c6098f20.
Breaks CodeGenCUDA/link-device-bitcode.cu in check-clang,
and many LLVM tests, see comments on https://reviews.llvm.org/D121169

after:  1061034926
before: 1063332844

Differential Revision: https://reviews.llvm.org/D121169

Main reason is preparation to transform AliasResult to class that contains
offset for PartialAlias case.

Reviewed By: asbirlea

Differential Revision: https://reviews.llvm.org/D98027

Summary:
To drive the automaton we used a uint64_t as an action type. This
contained the transition's resource requirements as a conjunction:

  (a OR b) AND (b OR c)

We encoded this conjunction as a sequence of four 16-bit bitmasks.
This limited the number of addressable functional units to 16, which
is quite low and has bitten many people in the past.

Instead, the DFAEmitter now generates a lookup table from InstrItinerary
class (index of the ItinData inside the ProcItineraries) to an internal
action index which is essentially a dense embedding of the conjunctive
form. Because we never materialize the conjunctive form, we no longer
have the 16 FU restriction.

In this patch we limit to 64 functional units due to using a uint64_t
bitmask in the DFAEmitter. Now that we've decoupled these representations
we can increase this in future.

Reviewers: ThomasRaoux, kparzysz, majnemer

Reviewed By: ThomasRaoux

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D69110