TemplateInstanceBox

This struct is needed for TemplateInstance to be the key in an associative array. Fixing https://issues.dlang.org/show_bug.cgi?id=15812 and https://issues.dlang.org/show_bug.cgi?id=15813 would make it unnecessary.

struct TemplateInstanceBox {
TemplateInstance ti;
__gshared
debug(FindExistingInstance)
uint nHits;
__gshared
debug(FindExistingInstance)
uint nCollisions;
}

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