[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, 20 insertions, 0 deletions

diff --git a/tests/language-feature/pointer/globallycoherent-ptr.slang b/tests/language-feature/pointer/globallycoherent-ptr.slang
new file mode 100644
index 000000000..4909537d7
--- /dev/null
+++ b/tests/language-feature/pointer/globallycoherent-ptr.slang
@@ -0,0 +1,20 @@
+//TEST:SIMPLE(filecheck=CHECK):-stage compute -entry computeMain -target spirv
+
+// Tests for invalid use of `globallycoherent` with Ptr/T*
+
+cbuffer Globals
+{
+    // CHECK: ([[# @LINE+1]]): error 30078
+    globallycoherent Ptr<int> ptr1;
+    // CHECK: ([[# @LINE+1]]): error 30078
+    globallycoherent int* ptr2;
+    // CHECK: ([[# @LINE+1]]): error 30078
+    coherent Ptr<int> ptr3;
+    // CHECK: ([[# @LINE+1]]): error 30078
+    coherent int* ptr4;
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(int id : SV_DispatchThreadID)
+{
+}