Update compile flags formatting

Author: mweber15

tests/codegen/issues/issue-98678-async.rs

@@ -1,8 +1,8 @@
 // This test verifies the accuracy of emitted file and line debuginfo metadata for async blocks and
 // async functions.
 //
-// edition: 2021
-// compile-flags: -C debuginfo=2 -Z debug-info-type-line-numbers=true
+//@ edition:2021
+//@ compile-flags: -C debuginfo=2 -Z debug-info-type-line-numbers=true
 #![crate_type = "lib"]
 
 // ignore-tidy-linelength

tests/codegen/issues/issue-98678-closure-coroutine.rs

@@ -1,7 +1,7 @@
 // This test verifies the accuracy of emitted file and line debuginfo metadata for closures and
 // coroutines.
 //
-// compile-flags: -C debuginfo=2 -Z debug-info-type-line-numbers=true
+//@ compile-flags: -C debuginfo=2 -Z debug-info-type-line-numbers=true
 #![crate_type = "lib"]
 #![feature(coroutines, stmt_expr_attributes)]
 

tests/codegen/issues/issue-98678-enum.rs

@@ -1,6 +1,6 @@
 // This test verifies the accuracy of emitted file and line debuginfo metadata enums.
 //
-// compile-flags: -C debuginfo=2 -Z debug-info-type-line-numbers=true
+//@ compile-flags: -C debuginfo=2 -Z debug-info-type-line-numbers=true
 #![crate_type = "lib"]
 
 // ignore-tidy-linelength

tests/codegen/issues/issue-98678-struct-union.rs

@@ -1,7 +1,7 @@
 // This test verifies the accuracy of emitted file and line debuginfo metadata for structs and
 // unions.
 //
-// compile-flags: -C debuginfo=2 -Z debug-info-type-line-numbers=true
+//@ compile-flags: -C debuginfo=2 -Z debug-info-type-line-numbers=true
 #![crate_type = "lib"]
 
 // ignore-tidy-linelength