Vyacheslav Levytskyy b0d03ccc08 [SPIR-V] Fix illegal OpConstantComposite instruction with non-const constituents in SPIR-V Backend (#86352) ...

This PR fixes illegal use of OpConstantComposite with non-constant
constituents. The test attached to the PR is able now to satisfy
`spirv-val` check. Before the fix SPIR-V Backend produced for the
attached test case a pattern like
```
%a = OpVariable %_ptr_CrossWorkgroup_uint CrossWorkgroup %uint_123
%11 = OpConstantComposite %_struct_6 %a %a
```
so that `spirv-val` complained with
```
error: line 25: OpConstantComposite Constituent <id> '10[%a]' is not a constant or undef.
  %11 = OpConstantComposite %_struct_6 %a %a
```

2024-03-25 10:14:46 +01:00

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