Update src/bootstrap/src/core/builder.rs

Co-authored-by: Onur Özkan <onurozkan.dev@outlook.com>

Author: scottmcm

src/bootstrap/src/core/builder.rs

@@ -2103,7 +2103,7 @@ impl<'a> Builder<'a> {
 // during incremental builds" heuristic for the standard library.
  rustflags.arg("-Zinline-mir");
 
-// always pass this after the next `#[cfg(bootstrap)]` update.
+// FIXME: always pass this after the next `#[cfg(bootstrap)]` update.
 if compiler.stage != 0{
 // Similarly, we need to keep debug info for functions inlined into other std functions,
 // even if we're not going to output debuginfo for the crate we're currently building,