R0 = 8
Fixes the heap. Subsequent calls to the Tidy or Compact routines will have no effect. Effectively, the heap becomes a non-relocatable heap like the RMA. This call is provided so that if you temporarily need to rely on the blocks not moving, you can easily do so. WimpExtension keeps a counter of the number of times you call this routine, so that if you, for example, fix the blocks twice in a row then you need to unfix them twice in a row before they are actually unfixed.
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