[PR] libc/mcount: add armv6m mcount implementation [nuttx]

[via GitHub]

Gary-Hobson opened a new pull request, #16675:
URL: https://github.com/apache/nuttx/pull/16675

   ## Summary
   libc/mcount: add armv6m mcount implementation
   
   armv6m does not support the complete Thumb-2 instruction set, resulting in 
compilation errors
   
   CC:  dirent/lib_alphasort.c mcount.S: Assembler messages:
   mcount.S:33: Error: cannot honor width suffix -- `bic r1,lr,#1'
   mcount.S:35: Error: cannot honor width suffix -- `bic r0,r0,#1'
   mcount.S:37: Error: cannot honor width suffix -- `pop {r0,r1,r2,r3,ip,lr}'
   
   ## Impact
   
   ## Testing
   raspberrypi-pico/nsh
   


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