Issue 141008.1: c++14 DW_LANG constant
Section 3.1, pg 44
In August C++14 ISO/IEC 14882:2014(E) was adopted. Since this version of C++ adds some new
language constructs and changes the semantics of some constructs it is useful for debuggers
to know the source language was C++14.
Page 44, Section 3.1.1, Figure 8. Language names add:
DW_LANG_C_plus_plus_14 ISO/IEC 14882:2014(E)
Page 172, Section 7.12, Figure 31. Language encodings add:
DW_LANG_C_plus_plus_14 0x001X 0
10/21/2014 - Accepted, assigned 0x21.