Re-enable rustc test that was disabled due to a rustc bug

Author: bjorn3

scripts/test_rustc_tests.sh

@@ -146,11 +146,6 @@ rm tests/ui/process/nofile-limit.rs # TODO some AArch64 linking issue
 
 rm tests/ui/stdio-is-blocking.rs # really slow with unoptimized libstd
 
-# rustc bugs
-# ==========
-# https://github.com/rust-lang/rust/pull/116447#issuecomment-1790451463
-rm tests/ui/coroutine/gen_block_*.rs
-
 cp ../dist/bin/rustdoc-clif ../dist/bin/rustdoc # some tests expect bin/rustdoc to exist
 
 # prevent $(RUSTDOC) from picking up the sysroot built by x.py. It conflicts with the one used by