Add support for specifying range attributes in Intrinsics.td. Use this
to specify the ucmp/scmp range [-1,2).

This case is trickier than existing intrinsic attributes, because we
need to create the attribute with the correct bitwidth. As such, the
attribute construction now needs to be aware of the function type.

We also need to be careful to no longer assign attributes on intrinsics
with invalid signatures, as we'd make invalid assumptions about the
number of arguments etc otherwise.

Fixes https://github.com/llvm/llvm-project/issues/130179.

Check name conflicts between intrinsics caused by mangling suffix.

If the base name of an overloaded intrinsic is a proper prefix of
another intrinsic, check if the other intrinsic name suffix after the
proper prefix can match a mangled type and issue an error if it can.

Change `CodeGenIntrinsics` classes to vend out const references to
`CodeGenIntrinsic` or `TargetSet` objects.

Validate that for target independent intrinsics the second dotted
component of their name (after the `llvm.`) does not match any existing
target names (for which atleast one intrinsic has been defined). Doing
so is invalid as LLVM will search for that intrinsic in that target's
intrinsic table and not find it, and conclude that its an unknown
intrinsic.

Check for duplicate intrinsic names in the intrinsic emitter backend and
issue a fatal error if we find one.

Fail if we see an intrinsic that returns more than the supported number
of return values.

Intrinsics can return only upto a certain nyumber of values, as defined
by the `IIT_RetNumbers` list in `Intrinsics.td`. Currently, if we define
an intrinsic that exceeds the limit, llvm-tblgen crashes. Instead, read
this limit and fail if it's exceeded with a proper error message.

- Add class `CodeGenIntrinsicMap` for on-demand creation of  
  `CodeGenIntrinsic`.
- Add class `CodeGenIntrinsicContext` to capture global information
  required to build `CodeGenIntrinsic` objects.
- Adopt GlobalISel PatternParser and SearchableTableEmitter to use it.

CodeGenIntrinsic changes:
  - Use `const` Record pointers, and `StringRef` when possible.
  - Default initialize several fields with their definition instead of in
 the constructor.
- Simplify various string checks in the constructor using StringRef
starts_with()/ends_with() functions.
- Eliminate first argument to `setDefaultProperties` and use `TheDef`
class member instead.

IntrinsicEmitter changes:
  - Emit `namespace llvm::Intrinsic` instead of nested namespaces.
  - End generated comments with a .
  - Use range based for loops, and early continue within loops.
  - Emit `static constexpr` instead of `static const` for arrays.
- Change `compareFnAttributes` to use std::tie() to compare intrinsic
attributes and return a default value when all attributes are equal.

STLExtras:
  - Add std::replace wrapper which takes a range.

- Fix include guards for headers under utils/TableGen to match their
paths.

Avoid std::vector copies as setDefaultProperties just iterates across the Records

Fixes #89207