Fix static variable initialization when they have the same value

[celinval]

Description of changes:

We were incorrectly deduping the allocation of constant static variables. Static variables should each have their own memory allocation, and it should be correctly initialized.

Resolved issues:

Resolves #2455

Related RFC:

N/A

Call-outs:

The fix to this issue was basically the change to static_var.rs. The changes to operand.rs was a bit of cleanup to make it explicit that we should only try to dedupe constant allocations.

Testing:

• How is this change tested? New test

• Is this a refactor change? Not really

Checklist

• Each commit message has a non-empty body, explaining why the change was made
• Methods or procedures are documented
• Regression or unit tests are included, or existing tests cover the modified code
• My PR is restricted to a single feature or bugfix

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT licenses.

[zhassan-aws]

Thanks!