Use long-long integer constant as the left-hand side is long long

Author: tautschnig

Diff for: src/util/mp_arith.cpp

@@ -302,8 +302,8 @@ mp_integer logic_left_shift(
   llong_t result=a.to_long()<<shift;
   if(true_size<(sizeof(llong_t)*8))
   {
-    llong_t sign=(1L<<(true_size-1))&result;
-    llong_t mask=(1L<<true_size)-1;
+    llong_t sign=(1LL<<(true_size-1))&result;
+    llong_t mask=(1LL<<true_size)-1;
     // Sign-fill out-of-range bits:
     if(sign==0)
       result&=mask;