InternPool: remove memoized_decl

This is neither a type nor a value. Simplifies `addStrLit` as well as
the many places that switch on `InternPool.Key`.

This is a partial revert of bec29b9e498e08202679aa29a45dab2a06a69a1e.

1 files changed, 1 insertions, 3 deletions

diff --git a/src/codegen/spirv.zig b/src/codegen/spirv.zig
index c7bea80eb6..85caec9490 100644
--- a/src/codegen/spirv.zig
+++ b/src/codegen/spirv.zig
@@ -831,9 +831,7 @@ pub const DeclGen = struct {
 
                     try self.addUndef(layout.padding);
                 },
-                .memoized_decl,
-                .memoized_call,
-                => unreachable,
+                .memoized_call => unreachable,
             }
         }
     };