Investigate temporary variables in P3 SK impl

[tcclevenger]

P3 Small Kernels has 56 temporary variables used inside p3_main(). We should investigate if some of the temporaries can alias others instead of 56 distinct memory allocations. List of variables in P3Temporaies struct:

scream/components/eamxx/src/physics/p3/p3_functions.hpp

Line 250 in e65666f

struct P3Temporaries {

.