[CBP] Pointer frontend changes + groupshared pointer support (#7848)

Resolves #7628
Resolves: #8197

Primary Goals:
1. Add `Access` to pointer
2. AddressSpace::GroupShared support for pointers (SPIR-V)
3. Add `__getAddress()` to replace `&`
* `&` is not updated to `require(cpu)` since slangpy uses `&`. This
means we must: (1) merge PR; (2) replace `&` with `__getAddress()`; (3)
add `require(cpu)` to `&`

Changes:
* Added to `Ptr` the `Access` generic argument & logic (for
`Access::Read`).
* Moved the generic argument `AddressSpace` from `Ptr` to the end of the
type.
* Added pointer casting support between any `Ptr` as long as the
`AddressSpace` is the same
* Disallow globallycoherent T* and coherent T*
* Disallow const T*, T const*, and const T*
* Fixed .natvis display of `ConstantValue` `ValOperandNode`
* Support generic resolution of type-casted integers
* Added `VariablePointer` emitting for spirv + other minor logic needed
for groupshared pointers

Breaking Changes:
* Anyone using the `AddressSpace` of `Ptr` will now have to account for
the `Access` argument
* we disallow various syntax paired with `Ptr` and `T*`

---------

Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/tests/spirv/pointer.slang b/tests/spirv/pointer.slang
index affc52e1b..f3b086e6a 100644
--- a/tests/spirv/pointer.slang
+++ b/tests/spirv/pointer.slang
@@ -28,12 +28,12 @@ void funcWithInOutParam(inout PP p)
 
 // CHECK: OpEntryPoint
 
-StructuredBuffer<Data> buffer;
+uniform Data* buffer;
 RWStructuredBuffer<int> output;
 void main(int id : SV_DispatchThreadID)
 {
     output[0] = buffer[0].pNext.data;
-    let pData = &(buffer[0].pNext->data); // operator -> is also allowed on pointer types.
+    let pData = __getAddress(buffer[0].pNext->data); // operator -> is also allowed on pointer types.
     // CHECK: OpPtrAccessChain
     int* pData1 = pData + 1;
     *pData1 = 3;