🚀 go-pugleaf

Using version 3.17, I changed the file rtl.c of GCC and recompiled.
That worked, and in accordance with the makefile the files
insn-*.[ch] were not touched because the contents were unchanged.

Then I did `make -t cc1'.  This should have touched those files and
many .o files that depend on them, and cc1 itself.  Instead, it
touched only the insn-*.[ch] files.  I did `make -t cc1' again;
this time it touched only the .o files.  The third `make -t cc1'
touched cc1.