add tests for ICE 94432

Fixes #94432

src/test/ui/generics/issue-94432-garbage-ice.rs

@@ -0,0 +1,10 @@
+// check-fail
+// dont-check-compiler-stdout
+// dont-check-compiler-stderr
+
+fn<EFBFBD>a<e>(){fn<EFBFBD>p(){e}} //~ ERROR unknown start of token: \u{fffd}
+//~^ ERROR unknown start of token: \u{fffd}
+//~^^ ERROR can't use generic parameters from outer function [E0401]
+//~^^^ WARN type parameter `e` should have an upper camel case name
+
+fn main(){}