[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, 8 insertions, 5 deletions

diff --git a/tests/language-feature/bitfield/msvc-repr-mixed.slang b/tests/language-feature/bitfield/msvc-repr-mixed.slang
index 47f03ad1d..cf1925dd6 100644
--- a/tests/language-feature/bitfield/msvc-repr-mixed.slang
+++ b/tests/language-feature/bitfield/msvc-repr-mixed.slang
@@ -19,20 +19,23 @@ struct MixedSizes {
     uint16_t d : 8;  // Same backing field
 };
 
+groupshared MixedSizes m;
+
+typealias GroupSharedPtr<T> = Ptr<T, Access::ReadWrite, AddressSpace::GroupShared>;
+
 [numthreads(1, 1, 1)]
 void computeMain()
 {
-    MixedSizes m;
     m.a = 0xA;
     m.b = 0xB;
     m.c = 0xCD;
     m.d = 0xEF;
 
     // Read the two backing fields separately
-    uint8_t* p8 = (uint8_t*)&m;
-    uint16_t* p16 = (uint16_t*)((uint8_t*)&m + 2); // Skip uint8_t + padding
+    GroupSharedPtr<uint8_t> p8 = (GroupSharedPtr<uint8_t>)__getAddress(m);
+    GroupSharedPtr<uint16_t> p16 = (GroupSharedPtr<uint16_t>)( ((GroupSharedPtr<uint8_t>)__getAddress(m)) + 2); // Skip uint8_t + padding
 
-    outputBuffer[0] = uint(*p8);
-    outputBuffer[1] = uint(*p16);
+    outputBuffer[0] = (uint)*p8;
+    outputBuffer[1] = (uint)*p16;
 }