Make source-based code coverage compatible with MIR inlining

When codegenning code coverage use the instance that coverage data was
originally generated for, to ensure basic level of compatibility with
MIR inlining.

compiler/rustc_codegen_ssa/src/mir/statement.rs

@@ -112,7 +112,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                 bx
             }
             mir::StatementKind::Coverage(box ref coverage) => {
-                self.codegen_coverage(&mut bx, coverage.clone());
+                self.codegen_coverage(&mut bx, coverage.clone(), statement.source_info.scope);
                 bx
             }
             mir::StatementKind::CopyNonOverlapping(box mir::CopyNonOverlapping {