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dfdc69b4 - [RISCV][llvm] Preliminary P extension codegen support (#162668)

[RISCV][llvm] Preliminary P extension codegen support (#162668) This is the initial support of P extension codegen, it only includes small part of instructions: PADD_H, PADD_B, PSADD_H, PSADD_B, PAADD_H, PAADD_B, PSADDU_H, PSADDU_B, PAADDU_H, PAADDU_B, PSUB_H, PSUB_B, PDIF_H, PDIF_B, PSSUB_H, PSSUB_B, PASUB_H, PASUB_B, PDIFU_H, PDIFU_B, PSSUBU_H, PSSUBU_B, PASUBU_H, PASUBU_B