C++: Accept test changes to GVN.

Author: MathiasVP

cpp/ql/test/library-tests/valuenumbering/GlobalValueNumbering/ir_gvn.expected

@@ -468,7 +468,7 @@ test.cpp:
 #   56|         valnum = r50_1, r55_3, r56_12, r56_19, r56_2, r59_1
 #   56|     r56_3(char *)        = Load[ptr]            : &:r56_2, m56_1
 #   56|         valnum = m56_1, r56_13, r56_20, r56_3, r59_2
-#   56|     r56_4(char)          = Load[?]              : &:r56_3, ~m49_4
+#   56|     r56_4(char)          = Load[?]              : &:r56_3, ~m49_12
 #   56|         valnum = r56_14, r56_4, r59_3
 #   56|     r56_5(int)           = Convert              : r56_4
 #   56|         valnum = r56_15, r56_5, r59_4
@@ -491,7 +491,7 @@ test.cpp:
 #   56|         valnum = r50_1, r55_3, r56_12, r56_19, r56_2, r59_1
 #   56|     r56_13(char *)        = Load[ptr]            : &:r56_12, m56_1
 #   56|         valnum = m56_1, r56_13, r56_20, r56_3, r59_2
-#   56|     r56_14(char)          = Load[?]              : &:r56_13, ~m49_4
+#   56|     r56_14(char)          = Load[?]              : &:r56_13, ~m49_12
 #   56|         valnum = r56_14, r56_4, r59_3
 #   56|     r56_15(int)           = Convert              : r56_14
 #   56|         valnum = r56_15, r56_5, r59_4
@@ -521,7 +521,7 @@ test.cpp:
 #   59|         valnum = r50_1, r55_3, r56_12, r56_19, r56_2, r59_1
 #   59|     r59_2(char *)        = Load[ptr]            : &:r59_1, m56_1
 #   59|         valnum = m56_1, r56_13, r56_20, r56_3, r59_2
-#   59|     r59_3(char)          = Load[?]              : &:r59_2, ~m49_4
+#   59|     r59_3(char)          = Load[?]              : &:r59_2, ~m49_12
 #   59|         valnum = r56_14, r56_4, r59_3
 #   59|     r59_4(int)           = Convert              : r59_3
 #   59|         valnum = r56_15, r56_5, r59_4