Name change for post inc operands
Issue [#60](https://github.com/openhwgroup/corev-gcc/issues/60) Files Changed: * config/riscv/riscv.cc: Name change for post inc operands. * testsuite/gcc.target/riscv/cv-mem-lb-compile-1.c: Likewise. * testsuite/gcc.target/riscv/cv-mem-lb-compile-2.c: Likewise. * testsuite/gcc.target/riscv/cv-mem-lbu-compile-1.c: Likewise. * testsuite/gcc.target/riscv/cv-mem-lbu-compile-2.c: Likewise. * testsuite/gcc.target/riscv/cv-mem-lh-compile-1.c: Likewise. * testsuite/gcc.target/riscv/cv-mem-lh-compile-2.c: Likewise. * testsuite/gcc.target/riscv/cv-mem-lhu-compile-1.c: Likewise. * testsuite/gcc.target/riscv/cv-mem-lhu-compile-2.c: Likewise. * testsuite/gcc.target/riscv/cv-mem-lw-compile-1.c: Likewise. * testsuite/gcc.target/riscv/cv-mem-lw-compile-2.c: Likewise. * testsuite/gcc.target/riscv/cv-mem-sb-compile-1.c: Likewise. * testsuite/gcc.target/riscv/cv-mem-sb-compile-2.c: Likewise. * testsuite/gcc.target/riscv/cv-mem-sh-compile-1.c: Likewise. * testsuite/gcc.target/riscv/cv-mem-sh-compile-2.c: Likewise. * testsuite/gcc.target/riscv/cv-mem-sw-compile-1.c: Likewise. * testsuite/gcc.target/riscv/cv-mem-sw-compile-2.c: Likewise. Signed-off-by: Mary Bennett <mary.bennett@embecosm.com>