Bytecode Format Change

All,

Just a heads up that the bytecode format changed again last night. If
you have bc files, they need to be refreshed. If you're running a
nightly tester, please refresh your llvm-gcc (mirror should be updated
now, or soon).

The change resulted from PR1146 which redesigns the parameter attribute
feature. With the redesign it became possible to reduce the size of a
function type definition by avoiding writing the parameter attributes if
there aren't any (many cases).

Sorry if this caused any inconvenience.

Reid.