When rebuilding chromeos-fonts for grunt, fc-cache crashes with an "Invalid instruction" error and causes the build to fall back to running through qemu.  Since grunt has an x86_64 processor, it's surprising that it doesn't run natively.  After the crash, dmesg has lines like this:

traps: fc-cache[58958] trap invalid opcode ip:7faef115db55 sp:7fff22c167e0 error:0 in libfreetype.so.6.16.0[7faef1123000+8f000]