Merge pull request #4560 from MathiasVP/instruction-tag-for-this-addr-and-load

C++: Make sure getInstructionTagId has a result for `this` related IPA branches

Author: Dave Bartolomeo

cpp/ql/src/semmle/code/cpp/ir/implementation/raw/internal/InstructionTag.qll

@@ -217,4 +217,8 @@ string getInstructionTagId(TInstructionTag tag) {
   tag = DynamicInitializationFlagConstantTag() and result = "DynInitFlagConst"
   or
   tag = DynamicInitializationFlagStoreTag() and result = "DynInitFlagStore"
+  or
+  tag = ThisAddressTag() and result = "ThisAddres"
+  or
+  tag = ThisLoadTag() and result = "ThisLoad"
 }