[clang][OMPIRBuilder] Fix two missed function pointer type issues (#162914)
Two small issues, when storing function pointers we need to use the
program address space.
With this change there are no asserts if I run all OpenMP tests with the
offload target manually changed to SPIR-V, so we are getting somewhere.
About 10 test fails though.
Signed-off-by: Sarnie, Nick <nick.sarnie@intel.com>