CPlusPlus: Increase maximum statement depth

We're hitting the limit in a real-world project.
(Of course, it's pretty horrific that we unconditionally access pointers
that can legally be null, but that's difficult to change now.)

Fixes: QTCREATORBUG-25606
Change-Id: I1d8c883550e8968bbfa6ce26965573697774361f
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/libs/3rdparty/cplusplus/Parser.cpp

@@ -39,7 +39,7 @@
 
 #define CPLUSPLUS_NO_DEBUG_RULE
 #define MAX_EXPRESSION_DEPTH 1000
-#define MAX_STATEMENT_DEPTH 100
+#define MAX_STATEMENT_DEPTH 300
 
 using namespace CPlusPlus;