Add support for __cxa_throw_bad_array_new_length in libcxxrt
It is required for use with newer g++49
Differential Revision: https://reviews.freebsd.org/D982
Reviewed by: theraven
Approved by: theraven
MFC r276417:
Import libcxxrt master 00bc29eb6513624824a6d7db2ebc768a4216a604.
Interesting fixes:
76584a0 Reorganize code to use only 32bit atomic ops for 32bit platforms
30d2ae5 Implement __cxa_throw_bad_array_new_length
Reviewed by: bapt
Differential Revision: https://reviews.freebsd.org/D1390