fix llvm compilation errors
fix llvm compilation errors

MCContext and InitMCObjectFileInfo name/signatures
are changed due to upstream patch
  https://reviews.llvm.org/D101462
Adjust related codes in bcc_debug.cc properly to resolve
the compilation error for llvm13.

Signed-off-by: Yonghong Song <e76892bbe783db2f627de1232e139db4de43da60@fb.com>

brendangregg/bcc,brendangregg/bcc,iovisor/bcc,brendangregg/bcc,iovisor/bcc,iovisor/bcc,brendangregg/bcc,iovisor/bcc,brendangregg/bcc,iovisor/bcc