auto-inline instrumentation code

_From [derek.br...@gmail.com](https://code.google.com/u/117968039472581148324/) on February 24, 2009 11:02:28_

auto-inline client calls when possible, with auto-saving of the minimal app
state for the instrumentation code in question

we could eliminate the arg push/pop and func prologue/epilogue and do
simple inlining without much implementation work

xref issue #42 (PR 307874): optimize and shrink clean call sequences based
on callee
analysis, short of full inlining

_Original issue: http://code.google.com/p/dynamorio/issues/detail?id=43_