Handle removal of LLVMAddTargetData in SVN revision 260919

Handle removal of LLVMAddTargetData in SVN revision 260919

LLVM removed LLVMAddTargetData for the 3.9 release in r260919.  For the two
places in mesa where this is called, only enable the lines when compiling
for less then 3.9.

For the radeon driver, I'm not sure how to check if any other LLVM calls need
to be adjusted.  I think since the target data used is extracted from the
LLVMModule, it isn't necessary to pass it back to LLVM again.

The code does compile, and at least for radeonsi does run OpenGL games.

[ Michel Dänzer: Move #if closer to LLVMAddTargetData in lp_bld_init.c,
  and add HAVE_LLVM < 0x0309 guards around now unused occurrences of TD
  and data_layout ]

Signed-off-by: Matthew Dawson <matthew@mjdsystems.ca>
Reviewed-and-Tested-by: Michel Dänzer <michel.daenzer@amd.com>