inline asm: Accept 'p' constraint and 'P' template mod

'p' is conservatively the same as 'r' and 'P' as template
modifier can be ignored in TCC.

i386-asm.c

@@ -1002,6 +1002,7 @@ static inline int constraint_priority(const char *str)
             pr = 2;
             break;
         case 'r':
+	case 'p':
             pr = 3;
             break;
         case 'N':
@@ -1170,6 +1171,7 @@ ST_FUNC void asm_compute_constraints(ASMOperand *operands,
             }
             goto try_next;
         case 'r':
+	case 'p': /* A general address, for x86(64) any register is acceptable*/
             /* any general register */
             for(reg = 0; reg < 8; reg++) {
                 if (!is_reg_allocated(reg))