x86_64 internal ELF linker:
* Split generation of regular and TLSIE GOT entries. Although code for both is similar to some extent, mixing them in a single method turns it into spaghetti.
* Several fixes to content and dynamic relocations of TLSIE entries.

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@25180 3ad0048d-3df7-0310-abae-a5850022a9f2