dwarfstack: Enable aarch64 builds

[hmartinez82]

Hernan@SURFACE7 CLANGARM64 
$ ./exception.exe
application crashed
code: 0xC0000005 (ACCESS_VIOLATION)
write access violation at 0x0000000000001234
base address: 0x00007FF6DB1C0000 (exception.exe)
    stack 00: 0x00007FF6DB1C1BB0 (crasher.c:10:6) [crasher]
    stack 01: 0x00007FF6DB1C146F (exception.c:117:3) [c]
    stack 02: 0x00007FF6DB1C1483 (exception.c:122:3) [b]
    stack 03: 0x00007FF6DB1C1497 (exception.c:127:3) [a]
    stack 04: 0x00007FF6DB1C14CF (exception.c:134:3) [main]
    stack 05: 0x00007FF6DB1C13CF (crtexe.c:266:15) [__tmainCRTStartup]
Segmentation fault