Fix GLSL memory layout qualifiers not applied to uniform buffers or cbuffers (#7740)

* Fix GLSL memory layout qualifiers not applied to uniform buffers or cbuffers

The `layout(scalar)` qualifier was being ignored for GLSL `uniform` blocks and
HLSL `cbuffer` declarations, causing them to use std140 layout instead of the
requested scalar layout.

**Root Cause**:
The parsing logic in `slang-parser.cpp` handled layout qualifiers inconsistently:
- GLSL `buffer` blocks correctly used `getLayoutArg()` to map layout modifiers
- GLSL `uniform` blocks and HLSL `cbuffer` skipped layout arguments entirely

**Solution**:
- Enhanced `parseHLSLCBufferDecl()` to check for GLSL layout qualifiers
- Added same `getLayoutArg()` logic used by buffer blocks
- Modified uniform block parsing to pass layout arguments through

**Testing**:
- Added comprehensive test case: `tests/glsl/layout-scalar-qualifier.slang`
- Verified fix works for both `uniform` blocks and `cbuffer` declarations
- Confirmed no regressions in existing test suite

**Before**: `layout(scalar) uniform {...}` → std140 layout (32 bytes, offset 0,16)
**After**: `layout(scalar) uniform {...}` → scalar layout (16 bytes, offset 0,4)

Fixes #7735

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-authored-by: pdeayton-nv <pdeayton-nv@users.noreply.github.com>

* Apply code formatting to slang-parser.cpp

Fixed line wrapping, trailing whitespace, and parameter formatting
according to repository style guidelines.

Co-authored-by: Harsh Aggarwal (NVIDIA) <szihs@users.noreply.github.com>

* format code (#7742)

Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: pdeayton-nv <pdeayton-nv@users.noreply.github.com>
Co-authored-by: Harsh Aggarwal (NVIDIA) <szihs@users.noreply.github.com>
Co-authored-by: slangbot <ellieh+slangbot@nvidia.com>
Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>
Co-authored-by: Yong He <yonghe@outlook.com>

0 files changed, 0 insertions, 0 deletions