Add global variant (to location) to BOF

[rtadros125]

Based on the conversations with LHM and DARPA, we are adding a global variant to the location parameter in the buffer errors class. Also, this PR closes #1053.

Sanity Testing:

• [x] Qemu
  • [x] FreeRTOS
  • [x] Debian
  • [x] FreeBSD
• [x] AWSF1
  • [x] FreeRTOS
    • [x] GFE
    • [x] LMCO
  • [x] Debian
    • [x] GFE
    • [x] LMCO
      • [x] default gcc
      • [x] baremetal gcc 8.3
  • [x] FreeBSD
    • [x] GFE
    • [x] SRI-UCam default
• [x] VCU118
  • [x] FreeRTOS
    • [x] Chisel_p1
    • [x] Bluespec_p1
  • [x] Debian
    • [x] GFE -- Bluspec_p2 (Clang/LLD)
    • [x] LMCO -- Chisel_p2
      • [x] default gcc
      • [x] baremetal gcc 8.3
  • [x] FreeBSD
    • [x] GFE -- Chisel_p2 (Clang/LLD)