Closes: #131009, #129796, #129749, #129561

---------

Co-authored-by: joaosaffran <joao.saffran@microsoft.com>

Fixes #112992

This introduces `@llvm.dx.resource.store.rawbuffer` and generalizes the
buffer store docs under DirectX/DXILResources.

Fixes #106188

This introduces `@llvm.dx.resource.load.rawbuffer` and generalizes the
buffer load docs under DirectX/DXILResources.

This resolves the "load" parts of #106188

We'd introduced separate versions of `llvm.dx.resource.load` with a
struct return to handle the CheckAccessFullyMapped case without making
the IR for the common case unnecessarily complicated. However, at this
point the common case is really `resource.getpointer`, so the ergonomics
of a simplified version of `load` don't actually gain us as much as the
cost of having multiple opcodes.

Drop the `dx.resource.loadchecked` functions and have `dx.resource.load`
consistently return `{element_type, i1}`.

Rename HLSL resource-related intrinsics to be consistent with the naming
conventions discussed in [wg-hlsl:0014].

This is an entirely mechanical change, consisting of the following
commands and automated formatting.

```sh
git grep -l handle.fromBinding | xargs perl -pi -e \
  's/(dx|spv)(.)handle.fromBinding/$1$2resource$2handlefrombinding/g'
git grep -l typedBufferLoad_checkbit | xargs perl -pi -e \
  's/(dx|spv)(.)typedBufferLoad_checkbit/$1$2resource$2loadchecked$2typedbuffer/g'
git grep -l typedBufferLoad | xargs perl -pi -e \
  's/(dx|spv)(.)typedBufferLoad/$1$2resource$2load$2typedbuffer/g'
git grep -l typedBufferStore | xargs perl -pi -e \
  's/(dx|spv)(.)typedBufferStore/$1$2resource$2store$2typedbuffer/g'
git grep -l bufferUpdateCounter | xargs perl -pi -e \
  's/(dx|spv)(.)bufferUpdateCounter/$1$2resource$2updatecounter/g'
git grep -l cast_handle | xargs perl -pi -e \
  's/(dx|spv)(.)cast.handle/$1$2resource$2casthandle/g'
```

[wg-hlsl:0014]: https://github.com/llvm/wg-hlsl/blob/main/proposals/0014-consistent-naming-for-dx-intrinsics.md

In the DXIL CreateHandle and CreateHandleFromBinding ops, resource
bindings are
indexed from the beginning of the binding space, not from the binding
itself.
Translate from an index into the binding to one from the beginning of
the space
when lowering to these operations.

This represents a typedBufferLoad that's followed by
"CheckAccessFullyMapped". It returns an extra `i1` representing that
value.

Fixes #108085