Use the new API to prevent retyping of Ltac2 variable quotations.
Use the new API to prevent retyping of Ltac2 variable quotations.

Fixes #12785: Ltac2 Performance Overhead.

JasonGross/coq,ejgallego/coq,coq/coq,Zimmi48/coq,JasonGross/coq,ejgallego/coq,Zimmi48/coq,SkySkimmer/coq,coq/coq,ejgallego/coq,coq/coq,Zimmi48/coq,SkySkimmer/coq,ejgallego/coq,JasonGross/coq,Zimmi48/coq,SkySkimmer/coq,SkySkimmer/coq,JasonGross/coq,coq/coq