add nqp::radix_I alias, fix op name

Author: moritz

src/PAST/NQP.pir

@@ -472,6 +472,7 @@ entry to produce the node to be returned.
     maphash['ln_n']     = 'ln__Nn'
     maphash['sqrt_n']   = 'sqrt__Nn'
     maphash['radix']    = 'nqp_radix__Pisii'
+    maphash['radix_I']  = 'nqp_bigint_radix__PisiiP'
     maphash['log_n']    = 'ln__NN'
     maphash['exp_n']    = 'exp__Nn'
 

src/ops/nqp_bigint.ops

@@ -239,7 +239,7 @@ The $5 flags is a bitmask that modifies the parse and/or result:
 
 */
 
-inline op nqp_radix(out PMC, in INT, in STR, in INT, in INT, in PMC) :base_core {
+inline op nqp_bigint_radix(out PMC, in INT, in STR, in INT, in INT, in PMC) :base_core {
     PMC      *out;
     INTVAL   radix  = $2;
     STRING   *str   = $3;