save-analysis: Use process_bounds when processing opaque impl item type
save-analysis: Use process_bounds when processing opaque impl item type

...since the code is literally the same and does the same thing.

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