Rename Abort terminator to Terminate

Unify terminology used in unwind action and terminator, and reflect
the fact that a nounwind panic is triggered instead of an immediate
abort is triggered for this terminator.

compiler/rustc_const_eval/src/transform/check_consts/check.rs

@@ -1031,9 +1031,9 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
                 self.check_op(ops::Generator(hir::GeneratorKind::Gen))
             }
 
-            TerminatorKind::Abort => {
+            TerminatorKind::Terminate => {
                 // Cleanup blocks are skipped for const checking (see `visit_basic_block_data`).
-                span_bug!(self.span, "`Abort` terminator outside of cleanup block")
+                span_bug!(self.span, "`Terminate` terminator outside of cleanup block")
             }
 
             TerminatorKind::Assert { .. }

compiler/rustc_const_eval/src/transform/check_consts/post_drop_elaboration.rs

@@ -104,7 +104,7 @@ impl<'tcx> Visitor<'tcx> for CheckLiveDrops<'_, 'tcx> {
                 }
             }
 
-            mir::TerminatorKind::Abort
+            mir::TerminatorKind::Terminate
             | mir::TerminatorKind::Call { .. }
             | mir::TerminatorKind::Assert { .. }
             | mir::TerminatorKind::FalseEdge { .. }

compiler/rustc_const_eval/src/transform/validate.rs

@@ -1015,10 +1015,13 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
                     );
                 }
             }
-            TerminatorKind::Resume | TerminatorKind::Abort => {
+            TerminatorKind::Resume | TerminatorKind::Terminate => {
                 let bb = location.block;
                 if !self.body.basic_blocks[bb].is_cleanup {
-                    self.fail(location, "Cannot `Resume` or `Abort` from non-cleanup basic block")
+                    self.fail(
+                        location,
+                        "Cannot `Resume` or `Terminate` from non-cleanup basic block",
+                    )
                 }
             }
             TerminatorKind::Return => {