[binutils-gdb] Fix TYPE_SPECIFIC_FIELD for types created via arch_type

[sergiodj+buildbot at sergiodj dot net]

*** TEST RESULTS FOR COMMIT ae438bc5c06b770c00f37e4ed244707ce3ab9ff4 ***

Author: Ulrich Weigand <ulrich.weigand@de.ibm.com>
Branch: master
Commit: ae438bc5c06b770c00f37e4ed244707ce3ab9ff4

Fix TYPE_SPECIFIC_FIELD for types created via arch_type

A type's TYPE_SPECIFIC_FIELD is supposed to be initialized as appropriate
for the type code.  This does happen if the type is created via init_type,
but not if it created via arch_type.

Fixed by extracting the initialization logic into a new set_type_code
routine, which is then called from both places.

gdb/ChangeLog:

	* gdbtypes.c (set_type_code): New function.
	(init_type, arch_type): Use it.

Signed-off-by: Ulrich Weigand <ulrich.weigand@de.ibm.com>