Don't trigger const_is_empty for inline const assertions

tests/ui/const_is_empty.rs

@@ -171,3 +171,17 @@ fn constant_from_external_crate() {
     let _ = std::env::consts::EXE_EXTENSION.is_empty();
     // Do not lint, `exe_ext` comes from the `std` crate
 }
+
+fn issue_13106() {
+    const {
+        assert!(!NON_EMPTY_STR.is_empty());
+    }
+
+    const {
+        assert!(EMPTY_STR.is_empty());
+    }
+
+    const {
+        EMPTY_STR.is_empty();
+    }
+}

tests/ui/const_is_empty.stderr

@@ -157,5 +157,11 @@ error: this expression always evaluates to true
 LL |     let _ = val.is_empty();
    |             ^^^^^^^^^^^^^^
 
-error: aborting due to 26 previous errors
+error: this expression always evaluates to true
+  --> tests/ui/const_is_empty.rs:185:9
+   |
+LL |         EMPTY_STR.is_empty();
+   |         ^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 27 previous errors