gdb_rust_pretty_printing: adapt to the changes in the layout of btree::LeafNode
gdb_rust_pretty_printing: adapt to the changes in the layout of btree::LeafNode

GBGamer/rust,aidancully/rust,GBGamer/rust,graydon/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,graydon/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,graydon/rust,aidancully/rust,GBGamer/rust,graydon/rust,graydon/rust,graydon/rust