C++: Add models for 'std::thread' and accept test changes.

Author: MathiasVP

cpp/ql/lib/ext/std.thread.model.yml

@@ -0,0 +1,11 @@
+extensions:
+  - addsTo:
+      pack: codeql/cpp-all
+      extensible: summaryModel
+    data: # namespace, type, subtypes, name, signature, ext, input, output, kind, provenance
+      - ["std", "thread", True, "thread", "", "", "Argument[*@1]", "Argument[0].Parameter[@0]", "value", "manual"]
+      - ["std", "thread", True, "thread", "", "", "Argument[*@2]", "Argument[0].Parameter[@1]", "value", "manual"]
+      - ["std", "thread", True, "thread", "", "", "Argument[*@3]", "Argument[0].Parameter[@2]", "value", "manual"]
+      - ["std", "thread", True, "thread", "", "", "Argument[*@4]", "Argument[0].Parameter[@3]", "value", "manual"]
+      - ["std", "thread", True, "thread", "", "", "Argument[*@5]", "Argument[0].Parameter[@4]", "value", "manual"]
+      

cpp/ql/test/library-tests/dataflow/taint-tests/thread.cpp

@@ -8,15 +8,15 @@ struct S {
 };
 
 void thread_function_1(S* s) {
-  sink(s->x); // $ MISSING: ir
+  sink(s->x); // $ ir
 }
 
 void thread_function_2(S s) {
-  sink(s.x); // $ MISSING: ir
+  sink(s.x); // $ ir
 }
 
 void thread_function_3(S* s, int y) {
-  sink(s->x); // $ MISSING: ir
+  sink(s->x); // $ ir
   sink(y); // clean
 }