=> R0 = pointer to zero terminated filter name
R1 = address of filter code
R2 = value to be passed in R12
<= all registers preserved
Adds a new Wimp_BlockCopy pre-filter to the list of pre-filters.
The address pointed to by R1 will be called whenever a task calls Wimp_BlockCopy with R12 equal to the value of R2 when this SWI is called.
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