Add _US_ACTION_MASK to libcxxrt's arm-specific unwind header. This
value is used in newer versions of compiler-rt.

MFC after: 3 days

libcxxrt: fix demangling of wchar_t

'wchar_t' is 7 characters long, not 6. r303297 fixed this in libelftc,
but not the second copy of this file that we have in libcxxrt.

PR: 208661
Submitted by: D

libcxxrt: fix demangling of wchar_t

'wchar_t' is 7 characters long, not 6. r303297 fixed this in libelftc,
but not the second copy of this file that we have in libcxxrt.

PR: 208661
Submitted by: Daniel McRobb
Obtained from: ELF Tool Chain r3480
MFC after: 3 days

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libcxxrt: add padding in __cxa_allocate_* to fix alignment

The addition of the referenceCount to __cxa_allocate_exception put the
unwindHeader at offset 0x58 in __cxa_exception, but it requires 16-b

libcxxrt: add padding in __cxa_allocate_* to fix alignment

The addition of the referenceCount to __cxa_allocate_exception put the
unwindHeader at offset 0x58 in __cxa_exception, but it requires 16-byte
alignment. In order to avoid changing the current __cxa_exception ABI
(and thus breaking its consumers), add explicit padding in the
allocation routines (and account for it when freeing).

This is intended as a lower-risk change for FreeBSD 11. A "more correct"
fix should be prepared for upstream and -CURRENT.

Reviewed by: dim
MFC after: 3 days
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D7271

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