C++: Make cpp/missing-return visible on LGTM again

Author: jbj

change-notes/1.19/analysis-cpp.md

@@ -14,6 +14,7 @@
 |----------------------------|------------------------|------------------------------------------------------------------|
 | Resource not released in destructor | Fewer false positive results | Placement new is now excluded from the query. |
 | Wrong type of arguments to formatting function | Fewer false positive results | False positive results involving typedefs have been removed. |
+| Missing return statement (`cpp/missing-return`) | Visible by default | The precision of this query has been increased from 'medium' to 'high', which makes it visible by default in LGTM. It was 'medium' in release 1.17 and 1.18 because it had false positives due to an extractor bug that was fixed in 1.18. |
 
 ## Changes to QL libraries
 

cpp/ql/src/jsf/4.13 Functions/AV Rule 114.ql

@@ -3,7 +3,7 @@
  * @description All functions that are not void should return a value on every exit path.
  * @kind problem
  * @problem.severity error
- * @precision medium
+ * @precision high
  * @id cpp/missing-return
  * @tags reliability
  *       readability