Preprocessor, optimal policy: check that instruments are declared endogenous

(manually cherry picked from commit 8f350237)

Preprocessor, optimal policy: check that instruments are declared endogenous
19a22f95 · Sébastien Villemot · ef3a9098 · d03b7446 · 37b38b46 · d03b7446
Verified Commit 19a22f95 authored 3 years ago by Sébastien Villemot
--- a/preprocessor @ d03b7446
+++ b/preprocessor @ d03b7446
-Subproject commit 37b38b46cc0e4b3c8dbef25de1171ce682622b15
+Subproject commit d03b74469afae3dd445bd621bdf2acb039396e87