Ensure walk_item visits GlobalAsm NodeId
Ensure walk_item visits GlobalAsm NodeId

Travis failures indicated the OuterVisitor#visit_item method caused a
panic. The Visitor's inner visitor actually relies on the visitor
visiting every item's NodeId. I forgot to perform that call in the
ItemGlobalAsm match arm, leading to build breakage. The fix is
simple: call visit_id(...) for ItemGlobalAsm

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