Add regression test to close #59572

Author: AnthonyLatsis

validation-test/compiler_crashers_2_fixed/issue59572.swift

@@ -0,0 +1,7 @@
+// RUN: %target-swift-emit-ir %s
+
+func foo<T: RawRepresentable>(src: Any, target: inout T) where T.RawValue == UInt {
+  if let x = src as? UInt, let x = T(rawValue: x) {
+    target = x
+  }
+}