This fixes the following warning when compiling with Apple clang 15.0.0:
Compiling C++ object libparser.dylib.p/Tools_Parser_ArabicShaping.cpp.o
../Tools/Parser/ArabicShaping.cpp:37:5: warning: field 'm_offsets' will be initialized after field 'm_firstCodePoint' [-Wreorder-ctor]
m_offsets(0x200000),
^~~~~~~~~~~~~~~~~~~
m_lastCodePoint(0)
1 warning generated.
This fixes the following warning when compiling with Apple clang 15.0.0: