* make x86memorymodel i8086 only

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@25369 3ad0048d-3df7-0310-abae-a5850022a9f2
+ arm: tsettings.instructionset
* the selected instruction set is now independent from the cpu type: e.g. armv7-a can perfectly execute thumb(2) code

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@25370 3ad0048d-3df7-0310-abae-a5850022a9f2