Imports of irdump command

PathSynopsis
flagPackage flag implements command-line flag parsing.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
go/buildPackage build gathers information about Go packages.
golang.org/x/tools/go/buildutilPackage buildutil provides utilities related to the go/build package in the standard library.
golang.org/x/tools/go/packagesPackage packages loads Go packages for inspection and analysis.
honnef.co/go/tools/go/irPackage ir defines a representation of the elements of Go programs (packages, types, functions, variables and constants) using a static single-information (SSI) form intermediate representation (IR) for the bodies of functions.
honnef.co/go/tools/go/ir/irutil
osPackage os provides a platform-independent interface to operating system functionality.
runtime/pprofPackage pprof writes runtime profiling data in the format expected by the pprof visualization tool.