cmd/compile: fix loclist for heap return vars without optimizations

[derekparker]

When compiling without optimizations certain variables such as
return params end up missing location lists.

Fixes #65405

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Please don’t reply on this GitHub thread. Visit golang.org/cl/684377.
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[gopherbot]

Message from Derek Parker:

Patch Set 2:

(1 comment)

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After addressing review feedback, remember to publish your drafts!

[gopherbot]

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[gopherbot]

This PR (HEAD: 994b9b0) has been imported to Gerrit for code review.

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