[SPIRV][Mesa][Nvidia] `reversebits.64.test` crashes the driver

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## Assert line:
https://gitlab.freedesktop.org/mesa/mesa/-/blob/231747b7fadf7fdc7d886ba43257afeb07b0620f/src/nouveau/compiler/nak/opt_copy_prop.rs#L291

## Exec line
```
llvm_rel_with_debug_offload/bin/offloader -debug-layer llvm_rel_with_debug_offload/tools/OffloadTest/test/clang-vk/Feature/HLSLLib/Output/reversebits.64.test.tmp/pipeline.yaml lvm_rel_with_debug_offload/tools/OffloadTest/test/clang-vk/Feature/HLSLLib/Output/reversebits.64.test.tmp.o
```

## Result
```
llvm_rel_with_debug_offload/bin/offloader -debug-layer /mnt/DevDrive/projects/llvm_builds/llvm_rel_with_debug_offload/tools/OffloadTest/test/clang-vk/Feature/HLSLLib/Output/reversebits.64.test.tmp/pipeline.yaml /mnt/DevDrive/projects/llvm_builds/llvm_rel_with_debug_offload/tools/OffloadTest/test/clang-vk/Feature/HLSLLib/Output/reversebits.64.test.tmp.o
Using Vulkan API
Physical device created.
Shader module created.
Copy command buffer created.
Memory buffers created.
Executed copy command buffer.
Execute command buffer created.
Descriptors: { type = 7, count = 2 }
Descriptor pool created.
Binding 2 descriptors.
Num Descriptor sets: 1
Updating Descriptor [0] { 0, 0 }
Updating Descriptor [1] { 0, 1 }
WriteDescriptors: 2
Descriptor sets created.
thread '' panicked at ../src/nouveau/compiler/nak/opt_copy_prop.rs:235:13:
assertion failed: src_ssa.comps() == 1
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
gpu-exec: error: Failed to create pipeline.
```

Reproduce the failure with the provided offloader command and the reversebits.64.test artifacts. Start at src/nouveau/compiler/nak/opt_copy_prop.rs around the referenced assertion and compare the reported lines 291 and 235. Done means the test no longer triggers the assertion or fails to create the pipeline.

Written by the indexing model from the issue text.