The assembler on older Mac's is buggy and requires 'movd' instructions instead of 'movq' on x64. This is worked around in newer GCCs, but for older ones it is easier to just not build LLint.

Do not use automatic conversion of Function<> to BLOCK.

Original by Allan Sandfeld Jensen.
(https://qt.gitorious.org/qt/qtwebkit/commit/23487c9a9b581ccc944b2c51dc52676362ff6b3b)