make [ifs_same_cond] use ignore_interior_mutablility configuration

tests/ui-toml/ifs_same_cond/clippy.toml

@@ -0,0 +1 @@
+ignore-interior-mutability = ["std::cell::Cell"]

tests/ui-toml/ifs_same_cond/ifs_same_cond.rs

@@ -0,0 +1,24 @@
+#![warn(clippy::ifs_same_cond)]
+#![allow(clippy::if_same_then_else, clippy::comparison_chain)]
+
+fn main() {}
+
+fn issue10272() {
+    use std::cell::Cell;
+
+    let x = Cell::new(true);
+    if x.get() {
+    } else if !x.take() {
+    } else if x.get() {
+        // ok, x is interior mutable type
+    } else {
+    }
+
+    let a = [Cell::new(true)];
+    if a[0].get() {
+    } else if a[0].take() {
+    } else if a[0].get() {
+        // ok, a contains interior mutable type
+    } else {
+    }
+}

tests/ui/ifs_same_cond.rs

@@ -51,6 +51,14 @@ fn issue10272() {
     } else if a.contains("ha") {
     } else if a == "wow" {
     }
+
+    let p: *mut i8 = std::ptr::null_mut();
+    if p.is_null() {
+    } else if p.align_offset(0) == 0 {
+    } else if p.is_null() {
+        // ok, p is mutable pointer
+    } else {
+    }
 }
 
 fn main() {}