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The varying param legalization pass didn't deal with this 1D form of
SV_DispatchThreadID for CPU targets:
```slang
void computeMain(int i : SV_DispatchThreadID)
```
Instead, it just overrode the type of `i` with a `uint3`, breaking lots
of code that attempted to use `i` for something, like a `switch`
statement for example.
I ran across this when going through `language-feature` tests for the
LLVM target, which will also use this legalization pass. I'm separately
submitting this now because this also fixes the existing CPU target. The
test I enable in this PR is one that was previously generating broken
code on CPU.
(somewhat related issue: #7468)
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