=> R0 = pointer to anchor word
R2 = tag of block to find
<= R2 = pointer to found block
This SWI scans the dumper's chain specified by the anchor word passed in R0 (usually the module's private word) for a block that matches the specified tag. The first matching tag found is returned - if none are found an error is generated.
See PRM 3, page 685.
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