[RISCV][GlobalISel] Legalize add/sub for wide and non-pow2 types
Legalize G_ADD, G_SUB, G_(S/U)ADD(O/E). We test for (s7, s48, s64, s96) on rv32 and (s15, s72, s128, s192) on rv64. Differential Revision: https://reviews.llvm.org/D157019
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