This is a preliminary to changes to come. No intended functionality change. llvm-svn: 66593
add efficient versions of op_begin and op_end. Up to now always those from User have been called, which in most cases follow an indirection (OperandList) even if the exact Instruction type is known. llvm-svn: 64331
llvm-svn: 53153
llvm-svn: 51712
llvm-svn: 50943