coverage: Clean up marker statements that aren't needed later

Some of the marker statements used by coverage are added during MIR building
for use by the InstrumentCoverage pass (during analysis), and are not needed
afterwards.

compiler/rustc_middle/src/mir/coverage.rs

@@ -88,14 +88,13 @@ pub enum CoverageKind {
     /// Marks a span that might otherwise not be represented in MIR, so that
     /// coverage instrumentation can associate it with its enclosing block/BCB.
     ///
-    /// Only used by the `InstrumentCoverage` pass, and has no effect during
-    /// codegen.
+    /// Should be erased before codegen (at some point after `InstrumentCoverage`).
     SpanMarker,
 
     /// Marks its enclosing basic block with an ID that can be referred to by
     /// side data in [`BranchInfo`].
     ///
-    /// Has no effect during codegen.
+    /// Should be erased before codegen (at some point after `InstrumentCoverage`).
     BlockMarker { id: BlockMarkerId },
 
     /// Marks the point in MIR control flow represented by a coverage counter.