Add test.

tests/mir-opt/inline/issue_106141.rs

@@ -0,0 +1,22 @@
+pub fn outer() -> usize {
+    inner()
+}
+
+fn index() -> usize {
+    loop {}
+}
+
+#[inline]
+fn inner() -> usize {
+    let buffer = &[true];
+    let index = index();
+    if buffer[index] {
+        index
+    } else {
+        0
+    }
+}
+
+fn main() {
+    outer();
+}