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.

tccasm.c

@@ -991,7 +991,10 @@ static void subst_asm_operands(ASMOperand *operands, int nb_operands,
             modifier = 0;
             if (*str == 'c' || *str == 'n' ||
                 *str == 'b' || *str == 'w' ||
-                *str == 'h' || *str == 'k' || *str == 'q')
+                *str == 'h' || *str == 'k' || *str == 'q' ||
+		/* P in GCC would add "@PLT" to symbol refs in PIC mode
+		   Ignore this in TCC.  */
+		*str == 'P')
                 modifier = *str++;
             index = find_constraint(operands, nb_operands, str, &str);
             if (index < 0)