class hold a MachineRegisterInfo member, and make the
MachineBasicBlock be passed in to SelectInstructions rather
than the FastISel constructor.

llvm-svn: 55076

register class.

llvm-svn: 55008

helper function.

llvm-svn: 55007

llvm-svn: 55004

llvm-svn: 55003

FastISel doesn't support yet.

llvm-svn: 55002

llvm-svn: 54998

llvm-svn: 54997

the comments in FastISelEmitter.cpp for details on what this is.
This is currently experimental and unusable.

llvm-svn: 54751