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r302450: libunwind: update to upstream snapshot r272680
The key improvement is that it may be built without cross-unwinding
support, which significantly reduces the stack space requirement.
r302456: libunwind: enable only the native unwinder by default
This significantly reduces stack space requirements, and runtimes
require only native unwinding.
r302475: libunwind: limit stack usage in unwind cursor
This may be reworked upstream but in the interim should address the
stack usage issue reported in the PR.
r303016: llvm-libunwind: use conventional (non-Darwin) X86 register numbers
For historical reasons Darwin/i386 has ebp and esp swapped in the
eh_frame register numbering. That is:
Darwin Other
Reg # eh_frame eh_frame DWARF
===== ======== ======== =====
4 ebp esp esp
5 esp ebp ebp
Although the UNW_X86_* constants are not supposed to be coupled to
DWARF / eh_frame numbering they are currently conflated in LLVM
libunwind, and thus we require the non-Darwin numbering.
PR: 206384
Approved by: re (kib)
Sponsored by: The FreeBSD Foundation
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