RTL iterators
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This structure describes the subrtxes of an rtx as follows:
- if the rtx has no subrtxes, START and COUNT are both 0.
- if all the subrtxes of an rtx are stored in a contiguous block
of XEXPs ("e"s), START is the index of the first XEXP and COUNT
is the number of them.
- otherwise START is arbitrary and COUNT is UCHAR_MAX.
rtx_all_subrtx_bounds applies to all codes. rtx_nonconst_subrtx_bounds
is like rtx_all_subrtx_bounds except that all constant rtxes are treated
as having no subrtxes. 
1.13.2