Changed post inc instructions mnemonic

Created by: MaryBennett

Files Changed:

• gas/config/tc-riscv.c: Added + operand.
• opcodes/riscv-dis.c: Likewise.
• opcodes/riscv-opc.c: Changed instruction mnemonic.
• gas/testsuite/gas/riscv/cv-mem-lbpost.d: Likewise.
• gas/testsuite/gas/riscv/cv-mem-lbpost.s: Likewise.
• gas/testsuite/gas/riscv/cv-mem-lbrrpost.d: Likewise.
• gas/testsuite/gas/riscv/cv-mem-lbrrpost.s: Likewise.
• gas/testsuite/gas/riscv/cv-mem-lbupost.d: Likewise.
• gas/testsuite/gas/riscv/cv-mem-lbupost.s: Likewise.
• gas/testsuite/gas/riscv/cv-mem-lburrpost.d: Likewise.
• gas/testsuite/gas/riscv/cv-mem-lburrpost.s: Likewise.
• gas/testsuite/gas/riscv/cv-mem-lhpost.d: Likewise.
• gas/testsuite/gas/riscv/cv-mem-lhpost.s: Likewise.
• gas/testsuite/gas/riscv/cv-mem-lhrrpost.d: Likewise.
• gas/testsuite/gas/riscv/cv-mem-lhrrpost.s: Likewise.
• gas/testsuite/gas/riscv/cv-mem-lhupost.d: Likewise.
• gas/testsuite/gas/riscv/cv-mem-lhupost.s: Likewise.
• gas/testsuite/gas/riscv/cv-mem-lhurrpost.d: Likewise.
• gas/testsuite/gas/riscv/cv-mem-lhurrpost.s: Likewise.
• gas/testsuite/gas/riscv/cv-mem-lwpost.d: Likewise.
• gas/testsuite/gas/riscv/cv-mem-lwpost.s: Likewise.
• gas/testsuite/gas/riscv/cv-mem-lwrrpost.d: Likewise.
• gas/testsuite/gas/riscv/cv-mem-lwrrpost.s: Likewise.
• gas/testsuite/gas/riscv/cv-mem-sbpost.d: Likewise.
• gas/testsuite/gas/riscv/cv-mem-sbpost.s: Likewise.
• gas/testsuite/gas/riscv/cv-mem-sbrrpost.d: Likewise.
• gas/testsuite/gas/riscv/cv-mem-sbrrpost.s: Likewise.
• gas/testsuite/gas/riscv/cv-mem-shpost.d: Likewise.
• gas/testsuite/gas/riscv/cv-mem-shpost.s: Likewise.
• gas/testsuite/gas/riscv/cv-mem-shrrpost.d: Likewise.
• gas/testsuite/gas/riscv/cv-mem-shrrpost.s: Likewise.
• gas/testsuite/gas/riscv/cv-mem-swpost.d: Likewise.
• gas/testsuite/gas/riscv/cv-mem-swpost.s: Likewise.
• gas/testsuite/gas/riscv/cv-mem-swrrpost.d: Likewise.
• gas/testsuite/gas/riscv/cv-mem-swrrpost.s: Likewise.