[upstreaming] Remove unused include in ClangExpressionParser.cpp

Author: Teemperor

lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.cpp

@@ -70,7 +70,6 @@
 #include "lldb/Core/Disassembler.h"
 #include "lldb/Core/Module.h"
 #include "lldb/Core/StreamFile.h"
-#include "lldb/Expression/ExpressionSourceCode.h"
 #include "lldb/Expression/IRExecutionUnit.h"
 #include "lldb/Expression/IRInterpreter.h"
 #include "lldb/Host/File.h"