The reinterpret builtins are generated separately because they
need the cross product of all types, 121 functions in total,
which is inconvenient to specify in the arm_sve.td file.
Reviewers: SjoerdMeijer, efriedma, ctetreau, rengolin
Reviewed By: efriedma
Tags: #clang
Differential Revision: https://reviews.llvm.org/D78756