YJIT: Remove guard_self_is_heap()

It's superseded by functionality added to jit_guard_known_klass().
In weird situations such as the ones in the included test,
guard_self_is_heap() triggered assertions.

Co-authored-by: Jemma Issroff <jemmaissroff@gmail.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/bootstraptest/test_yjit.rb b/bootstraptest/test_yjit.rb
index 140365ee0c..e50d78a9dc 100644
--- a/bootstraptest/test_yjit.rb
+++ b/bootstraptest/test_yjit.rb
@@ -1,3 +1,14 @@
+assert_equal '[nil, nil, nil, nil, nil, nil]', %q{
+  [NilClass, TrueClass, FalseClass, Integer, Float, Symbol].each do |klass|
+    klass.class_eval("def foo = @foo")
+  end
+
+  [nil, true, false, 0xFABCAFE, 0.42, :cake].map do |instance|
+    instance.foo
+    instance.foo
+  end
+}
+
 assert_equal '0', %q{
   # This is a regression test for incomplete invalidation from
   # opt_setinlinecache. This test might be brittle, so