[Runtime] Allow runtime to be compiled in ILP32 mode.

[erick-xanadu]

Context: Error seen when compiling on macOS arm64

Description of the Change: Remove reinterpret_cast

Benefits: Can compile with ILP32 mode (used by macOS)

[codecov]

Codecov Report

Merging #230 (d452dd3) into main (74e59e1) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #230      +/-   ##
==========================================
- Coverage   99.22%   99.22%   -0.01%     
==========================================
  Files          37       37              
  Lines        6699     6697       -2     
  Branches      340      340              
==========================================
- Hits         6647     6645       -2     
  Misses         29       29              
  Partials       23       23              

Files Changed	Coverage Δ
...time/lib/backend/lightning/LightningObsManager.hpp	100.00% <100.00%> (ø)
runtime/tests/Test_LightningCoreQIS.cpp	100.00% <100.00%> (ø)

[erick-xanadu]

@maliasadi I think we don't need a change log for this one, what do you think?

[mlxd]

@maliasadi I think we don't need a change log for this one, what do you think?

Always good to add a changelog :)

[maliasadi]

Thanks @erick-xanadu! Don't forget to check other devices (lightning-kokkos, openqasm) too.

[maliasadi]

@maliasadi I think we don't need a change log for this one, what do you think?

I think it's good to add this for the future reference.

[erick-xanadu]

Don't forget to check other devices (lightning-kokkos, openqasm) too.

What do you mean here? Wouldn't the CI/CD tests cover these?

[maliasadi]

What do you mean here? Wouldn't the CI/CD tests cover these?

You may need to update other devices Obs Manager classes after building catalyst with those backend devices on our local MacOS arm64 device.

CI/CD checks all the devices but not on MacOS arm64 yet.

[erick-xanadu]

Got it. They all unconditionally get compiled, correct? If that's the case, then since this is a compile time error, this patch should be sufficient.

[maliasadi]

You still need to check/update LightningKokkosObsManager and maybe OpenQASMObsManager. Did you check those devices on the machine?

[maliasadi]

💯

[maliasadi]

[sc-43392]