Merge #216

216: Add unwind information to external assembly r=jonas-schievink a=Tiwalun

Add unwind information to the external assembly files, as discussed in #215.

The `.debug_frame` section is now present:
```

cortex-m.o   (ex bin/thumbv6m-none-eabi.a):
section              size   addr
.text                 0x0    0x0
.data                 0x0    0x0
.bss                  0x0    0x0
.text.__bkpt          0x4    0x0
.text.__control_r     0x6    0x0
.text.__control_w     0x6    0x0
.text.__cpsid         0x4    0x0
.text.__cpsie         0x4    0x0
.text.__delay         0x8    0x0
.text.__dmb           0x6    0x0
.text.__dsb           0x6    0x0
.text.__isb           0x6    0x0
.text.__msp_r         0x6    0x0
.text.__msp_w         0x6    0x0
.text.__nop           0x2    0x0
.text.__primask       0x6    0x0
.text.__psp_r         0x6    0x0
.text.__psp_w         0x6    0x0
.text.__sev           0x4    0x0
.text.__udf           0x2    0x0
.text.__wfe           0x4    0x0
.text.__wfi           0x4    0x0
.debug_line         0x161    0x0
.debug_info          0x22    0x0
.debug_abbrev        0x12    0x0
.debug_aranges       0xb0    0x0
.debug_str           0x30    0x0
.debug_ranges        0xa8    0x0
.debug_frame        0x140    0x0
.ARM.attributes      0x1c    0x0
Total               0x4d9
```


Co-authored-by: Dominik Boehi <dominik.boehi@gmail.com>

0 files changed, 0 insertions, 0 deletions