tcg: Rename TCGMemOpIdx to MemOpIdx

We're about to move this out of tcg.h, so rename it
as we did when moving MemOp.

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/sparc/ldst_helper.c

@@ -1318,7 +1318,7 @@ uint64_t helper_ld_asi(CPUSPARCState *env, target_ulong addr,
     case ASI_SNF:
     case ASI_SNFL:
         {
-            TCGMemOpIdx oi;
+            MemOpIdx oi;
             int idx = (env->pstate & PS_PRIV
                        ? (asi & 1 ? MMU_KERNEL_SECONDARY_IDX : MMU_KERNEL_IDX)
                        : (asi & 1 ? MMU_USER_SECONDARY_IDX : MMU_USER_IDX));