Auto merge of #90536 - crlf0710:fix_vtable_hrtb, r=jackh726

Erase regions within `vtable_trait_first_method_offset`

Fixes #90177 .

r? `@jackh726`

src/test/ui/hrtb/issue-90177.rs

@@ -0,0 +1,32 @@
+// check-pass
+
+trait Base<'f> {
+    type Assoc;
+
+    fn do_something(&self);
+}
+
+trait ForAnyLifetime: for<'f> Base<'f> {}
+
+impl<T> ForAnyLifetime for T where T: for<'f> Base<'f> {}
+
+trait CanBeDynamic: ForAnyLifetime + for<'f> Base<'f, Assoc = ()> {}
+
+fn foo(a: &dyn CanBeDynamic) {
+    a.do_something();
+}
+
+struct S;
+
+impl<'a> Base<'a> for S {
+    type Assoc = ();
+
+    fn do_something(&self) {}
+}
+
+impl CanBeDynamic for S {}
+
+fn main() {
+    let s = S;
+    foo(&s);
+}