compiler: Add rustc_abi dependence to the compiler

Depend on rustc_abi in compiler crates that use it indirectly but have
not yet taken on that dependency, and are not entangled in my other PRs.
This leaves an "excise rustc_target" step after the dust settles.

compiler/rustc_pattern_analysis/src/rustc/print.rs

@@ -11,10 +11,10 @@
 
 use std::fmt;
 
+use rustc_abi::{FieldIdx, VariantIdx};
 use rustc_middle::bug;
 use rustc_middle::ty::{self, AdtDef, Ty, TyCtxt};
 use rustc_span::sym;
-use rustc_target::abi::{FieldIdx, VariantIdx};
 
 #[derive(Clone, Debug)]
 pub(crate) struct FieldPat {