Fix 7441: CUDA boolean vector layout to use 1-byte elements (#7862)

* Fix 7441: CUDA boolean vector layout to use 1-byte elements

Boolean vectors (bool1, bool2, bool3, bool4) were incorrectly implemented
as integer-based types using 4 bytes per element instead of actual 1-byte
boolean elements on CUDA targets.

Changes:
- Update CUDA prelude to define boolean vectors as structs with bool fields
  instead of typedef aliases to integer vectors
- Implement CUDALayoutRulesImpl::GetVectorLayout to use 1-byte alignment
  for boolean vectors, matching actual CUDA memory layout behavior
- Update make_bool functions to populate struct fields correctly

This ensures boolean vectors have the same memory layout as bool[4] arrays:
- bool1: 1 byte (was 4 bytes)
- bool2: 2 bytes (was 8 bytes)
- bool3: 3 bytes (was 12 bytes)
- bool4: 4 bytes (was 16 bytes)

Fixes memory layout mismatch between Slang reflection API and actual
CUDA compilation, achieving 75% memory savings for boolean vector usage.

* Fix CI issues -

Add and update associated functions and operators

* Make boolX same as uchar

* Use align construct on struct for boolX

* Improve Test case for robust alignment checks

* Formatting

* Disable selected slangpy tests

* add metal check which is slightly different than cuda

* Test-1

* Test-2

* Test-3

* Test-4

* ReflectionChange

* cleanup and update

* _slang_select with plain bool is needed for reverse-loop-checkpoint-test

1 files changed, 2 insertions, 2 deletions

diff --git a/tests/metal/nested-parameter-block-reflection.slang b/tests/metal/nested-parameter-block-reflection.slang
index a294755da..91c07b9c8 100644
--- a/tests/metal/nested-parameter-block-reflection.slang
+++ b/tests/metal/nested-parameter-block-reflection.slang
@@ -6,13 +6,13 @@
 // CHECK: "binding": {"kind": "constantBuffer", "index": 0},
 
 // CHECK:"name": "pdata",
-// CHECK:"binding": {"kind": "uniform", "offset": 0, "size": 16}
+// CHECK:"binding": {"kind": "uniform", "offset": 0, "size": 16, "elementStride": 4}
 // CHECK:"name": "tex",
 
 // Since we will apply MetalArgumentBufferTier2, 'tex' here will just be a uniform.
 // The pdata is a nested parameter block, so it will be a 64-bit device pointer which take
 // 8 bytes. So the offset of `tex` will be 8 bytes.
-// CHECK:"binding": {"kind": "uniform", "offset": 8, "size": 8}
+// CHECK:"binding": {"kind": "uniform", "offset": 8, "size": 8, "elementStride": 0}
 
 
 // Check that there will be only two bindings.