Fix lifetime errors due to interner

In the llvm backend, there are the lifetimes `'a` (lifetime of the
global arena) and `'ctx` (lifetime of constructed LLVM values). `'a`
lives longer than `'ctx`, but the compiler didn't enforce this until
the layout interner was introduced, for some reason. We have to make
sure that containers of lifetime `'a` have no `'ctx` references.

crates/compiler/alias_analysis/src/lib.rs

@@ -134,15 +134,15 @@ fn bytes_as_ascii(bytes: &[u8]) -> String {
     buf
 }
 
-pub fn spec_program<'a, I>(
+pub fn spec_program<'a, 'r, I>(
     arena: &'a Bump,
-    interner: &mut STLayoutInterner<'a>,
+    interner: &'r mut STLayoutInterner<'a>,
     opt_level: OptLevel,
     entry_point: roc_mono::ir::EntryPoint<'a>,
     procs: I,
 ) -> Result<morphic_lib::Solutions>
 where
-    I: Iterator<Item = &'a Proc<'a>>,
+    I: Iterator<Item = &'r Proc<'a>>,
 {
     let main_module = {
         let mut m = ModDefBuilder::new();