loongarch64 build failure on 32-bit host

loongarch64 build failure on 32-bit host

gas/config/tc-loongarch.c: In function ‘loongarch_args_parser_can_match_arg_helper’:
gas/config/tc-loongarch.c:661:13: error: cast from pointer to integer of different size [-Werror=pointer
-to-int-cast]
  661 |       imm = (offsetT) str_hash_find (r_htab, arg);
      |             ^

Cast it to the correct size int, relying on normal integer promotions
if offsetT is larger than a pointer.

	* config/tc-loongarch.c (loongarch_args_parser_can_match_arg_helper):
	Cast return from str_hash_find to intptr_t, not offsetT.