* arm thumb supports only tst reg1,reg2

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@23997 3ad0048d-3df7-0310-abae-a5850022a9f2
* disable assembler versions of string routines for arm thumb

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@23998 3ad0048d-3df7-0310-abae-a5850022a9f2
* remove superfluous texts after endif

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@23999 3ad0048d-3df7-0310-abae-a5850022a9f2
* arm thumb knows only positively growing stacks

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24000 3ad0048d-3df7-0310-abae-a5850022a9f2