[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, 6 insertions, 4 deletions

diff --git a/tests/language-feature/pointer/pointer-self-reference.slang b/tests/language-feature/pointer/pointer-self-reference.slang
index e78b70db0..75ff4e7a9 100644
--- a/tests/language-feature/pointer/pointer-self-reference.slang
+++ b/tests/language-feature/pointer/pointer-self-reference.slang
@@ -1,6 +1,8 @@
 // pointer-self-reference.slang
 
-//TEST(compute):COMPARE_COMPUTE_EX:-cpu -compute -output-using-type -shaderobj
+// We are disabling this test because '&' is intentionally not supported.
+// Design for pointers in Slang are not yet finalized.
+//DISABLE_TEST(compute):COMPARE_COMPUTE_EX:-cpu -compute -output-using-type -shaderobj
 
 //TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
 RWStructuredBuffer<int> outputBuffer;
@@ -18,13 +20,13 @@ void computeMain(int3 dispatchThreadID: SV_DispatchThreadID)
     
     Thing things[2];
     
-    things[0].next = &things[1];
+    things[0].next = __getAddress(things[1]);
     things[0].value = 27;
     
-    things[1].next = &things[0];
+    things[1].next = __getAddress(things[0]);
     things[1].value = idx * idx;
     
-    Ptr<Thing> cur = &things[0];
+    Ptr<Thing> cur = __getAddress(things[0]);
     
     for (int i = 0; cur && i < idx; ++i)
     {