[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, 4 insertions, 4 deletions

diff --git a/tests/bugs/gh-3601.slang b/tests/bugs/gh-3601.slang
index 5d545262b..65245f971 100644
--- a/tests/bugs/gh-3601.slang
+++ b/tests/bugs/gh-3601.slang
@@ -4,7 +4,7 @@ struct TestStruct
     uint index;
 };
 
-[[vk::binding(2, 0)]] StructuredBuffer<uint64_t> test;
+[[vk::binding(2, 0)]] uniform uint64_t* test;
 
 struct PP
 {
@@ -28,15 +28,15 @@ int* funcThatReturnsPointer(PP* p)
 
 // CHECK: OpEntryPoint
 
-[[vk::binding(0, 0)]] StructuredBuffer<Data> buffer;
+[[vk::binding(0, 0)]] uniform Data* buffer;
 [[vk::binding(1, 0)]] RWStructuredBuffer<int> output;
 [shader("compute")]
 [numthreads(8, 8, 1)]
 void main(int id : SV_DispatchThreadID)
 {
-    TestStruct * ptr = (TestStruct *)(test[0]);
+    TestStruct* ptr = (TestStruct*)(test[0]);
     output[0] = buffer[ptr.index].pNext.data;
-    let pData = &(buffer[0].pNext.data);
+    let pData = __getAddress(buffer[0].pNext.data);
     // CHECK: OpPtrAccessChain
     int* pData1 = pData + 1;
     *pData1 = 3;