C++: Add an example of double negation to the IR tests.

Author: MathiasVP

cpp/ql/test/library-tests/ir/ir/PrintAST.expected

@@ -4932,7 +4932,20 @@ ir.c:
 #  103|             Type = [IntType] int
 #  103|             ValueCategory = prvalue(load)
 #  103|       getThen(): [BlockStmt] { ... }
-#  104|     getStmt(16): [ReturnStmt] return ...
+#  105|     getStmt(16): [DeclStmt] declaration
+#  105|       getDeclarationEntry(0): [VariableDeclarationEntry] definition of double_negation
+#  105|           Type = [IntType] int
+#  105|         getVariable().getInitializer(): [Initializer] initializer for double_negation
+#  105|           getExpr(): [NotExpr] ! ...
+#  105|               Type = [IntType] int
+#  105|               ValueCategory = prvalue
+#  105|             getOperand(): [NotExpr] ! ...
+#  105|                 Type = [IntType] int
+#  105|                 ValueCategory = prvalue
+#  105|               getOperand(): [VariableAccess] x1
+#  105|                   Type = [IntType] int
+#  105|                   ValueCategory = prvalue(load)
+#  106|     getStmt(17): [ReturnStmt] return ...
 ir.cpp:
 #    1| [TopLevelFunction] void Constants()
 #    1|   <params>: 

cpp/ql/test/library-tests/ir/ir/aliased_ir.expected

@@ -3969,11 +3969,18 @@ ir.c:
 #  103|     v103_6(void) = NoOp : 
 #-----|   Goto -> Block 40
 
-#  104|   Block 40
-#  104|     v104_1(void) = NoOp         : 
-#   84|     v84_9(void)  = ReturnVoid   : 
-#   84|     v84_10(void) = AliasedUse   : m84_3
-#   84|     v84_11(void) = ExitFunction : 
+#  105|   Block 40
+#  105|     r105_1(glval<int>) = VariableAddress[double_negation] : 
+#  105|     r105_2(glval<int>) = VariableAddress[x1]              : 
+#  105|     r105_3(int)        = Load[x1]                         : &:r105_2, m84_6
+#  105|     r105_4(int)        = Constant[0]                      : 
+#  105|     r105_5(bool)       = CompareEQ                        : r105_3, r105_4
+#  105|     r105_6(bool)       = LogicalNot                       : r105_5
+#  105|     m105_7(int)        = Store[double_negation]           : &:r105_1, r105_6
+#  106|     v106_1(void)       = NoOp                             : 
+#   84|     v84_9(void)        = ReturnVoid                       : 
+#   84|     v84_10(void)       = AliasedUse                       : m84_3
+#   84|     v84_11(void)       = ExitFunction                     : 
 
 ir.cpp:
 #    1| void Constants()

cpp/ql/test/library-tests/ir/ir/ir.c

@@ -101,6 +101,8 @@ void branch_on_integral_in_c(int x1, int x2) {
   int x_1_and_2 = x1 && x2;
   if(x_1_and_2) {}
   if(!x_1_and_2) {}
+
+  int double_negation = !!x1;
 }
 
 // semmle-extractor-options: --microsoft

cpp/ql/test/library-tests/ir/ir/raw_ir.expected

@@ -3605,11 +3605,18 @@ ir.c:
 #  103|     v103_6(void) = NoOp : 
 #-----|   Goto -> Block 40
 
-#  104|   Block 40
-#  104|     v104_1(void) = NoOp         : 
-#   84|     v84_8(void)  = ReturnVoid   : 
-#   84|     v84_9(void)  = AliasedUse   : ~m?
-#   84|     v84_10(void) = ExitFunction : 
+#  105|   Block 40
+#  105|     r105_1(glval<int>) = VariableAddress[double_negation] : 
+#  105|     r105_2(glval<int>) = VariableAddress[x1]              : 
+#  105|     r105_3(int)        = Load[x1]                         : &:r105_2, ~m?
+#  105|     r105_4(int)        = Constant[0]                      : 
+#  105|     r105_5(bool)       = CompareEQ                        : r105_3, r105_4
+#  105|     r105_6(bool)       = LogicalNot                       : r105_5
+#  105|     mu105_7(int)       = Store[double_negation]           : &:r105_1, r105_6
+#  106|     v106_1(void)       = NoOp                             : 
+#   84|     v84_8(void)        = ReturnVoid                       : 
+#   84|     v84_9(void)        = AliasedUse                       : ~m?
+#   84|     v84_10(void)       = ExitFunction                     : 
 
 ir.cpp:
 #    1| void Constants()