When I say "make 2 FAST=YES" in compiler/, the make system is supposed to 
recompile the stage-2 compiler, but ignoring the fact that the stage-1 compiler 
has changed.  It used to do that.
But now it doesn't.  It recompiles every module in GHC, and every module in the 
base libraries on which GHC depends.  The recompilation checker then spots that 
nothing has changed, but it still takes several unnecessary minutes.
Would it be possible to restore the old behaviour?  It saves quite a lot of 
time when rebuilding stage2 after a minor change.
Thanks!
Simon
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