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_mir_transform/src/coverage/graph.rs

@@ -122,7 +122,7 @@ impl CoverageGraph {
 
             match term.kind {
                 TerminatorKind::Return { .. }
-                | TerminatorKind::Abort
+                | TerminatorKind::Terminate
                 | TerminatorKind::Yield { .. }
                 | TerminatorKind::SwitchInt { .. } => {
                     // The `bb` has more than one _outgoing_ edge, or exits the function. Save the
@@ -136,7 +136,7 @@ impl CoverageGraph {
                     debug!("  because term.kind = {:?}", term.kind);
                     // Note that this condition is based on `TerminatorKind`, even though it
                     // theoretically boils down to `successors().len() != 1`; that is, either zero
-                    // (e.g., `Return`, `Abort`) or multiple successors (e.g., `SwitchInt`), but
+                    // (e.g., `Return`, `Terminate`) or multiple successors (e.g., `SwitchInt`), but
                     // since the BCB CFG ignores things like unwind branches (which exist in the
                     // `Terminator`s `successors()` list) checking the number of successors won't
                     // work.