powerpc/mpc2860ads:Add per-section compilation and linking support(GCI 2018)

[Shashvat Jain]

Hello ,
The per-function section linking has been enabled under this patch.
I am adding Chris , to discuss about the differ in my bss and dec drops and
that of Dr.Joel's
My size drop change can be seen here
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The size of the sample executables without this option were:

   text       data        bss        dec        hex    filename
 257876       3416     148812     410104      641f8    ./capture.exe
 126956       2428     145836     275220      43314    ./base_sp.exe
 330400       4600     146916     481916      75a7c    ./cdtest.exe
1092476      23588     153684    1269748     135ff4    ./cxx_iostream.exe
 654892       6056     158868     819816      c8268    ./fileio.exe
 159260       2812     145956     308028      4b33c    ./hello.exe
 339392       7344     152824     499560      79f68    ./loopback.exe
 106388       2276     142644     251308      3d5ac    ./minimum.exe
 156348       2960     145980     305288      4a888    ./nsecs.exe
 201020       3204     146592     350816      55a60    ./paranoia.exe
 547684      13548     175556     736788      b3e14    ./pppd.exe
 130108       2468     145872     278448      43fb0    ./ticker.exe
 129740       2436     149696     281872      44d10    ./unlimited.exe

The size of the sample executables with this option were:

   text       data        bss        dec        hex    filename
 246508       2856     147036     396400      60c70    ./cxx_iostream.exe
 641752       6016     158548     806316      c4dac    ./fileio.exe
 148264       2800     145916     296980      48814    ./hello.exe
 319252       7340     152756     479348      75074    ./loopback.exe
 100396       2288     142556     245240      3bdf8    ./minimum.exe
 148200       2932     145892     297024      48840    ./nsecs.exe
 190520       3192     146552     340264      53128    ./paranoia.exe
 531300      13544     175480     720324      afdc4    ./pppd.exe
 124008       2472     145788     272268      4278c    ./ticker.exe
 127848       2432     149660     279940      44584    ./unlimited.exe
 121272       2432     145752     269456      41c90    ./base_sp.exe
 241104       3412     148768     393284      60044    ./capture.exe
 245424       2936     146876     395236      607e4    ./cdtest.exe
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Thank you
Regards

--Shashvat
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