* MIPS: doing progress with peephole optimizer.

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@28628 3ad0048d-3df7-0310-abae-a5850022a9f2
+ internal assembler: early check for empty asmlists.

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@28629 3ad0048d-3df7-0310-abae-a5850022a9f2