Use fort bin dir insead of obj root

Author: ppenzin

test/lit.cfg

@@ -27,6 +27,7 @@ config.test_source_root = os.path.dirname(__file__)
 fort_obj_root = getattr(config, 'fort_obj_root', None)
 if fort_obj_root is not None:
     config.test_exec_root = os.path.join(fort_obj_root, 'test')
+    config.fort_bin_dir = fort_bin_dir = os.path.join(fort_obj_root, 'bin')
 
 # Set llvm_{src,obj}_root for use by others.
 config.llvm_src_root = getattr(config, 'llvm_src_root', None)
@@ -39,7 +40,7 @@ if fort_obj_root is not None:
         lit.fatal('No LLVM tools dir set!')
     # Set PATH - prepend fort bin dir and LLVM tools dir
     # Fort bin dir needs to come first in case it is an out of tree build
-    path = os.path.pathsep.join((fort_obj_root, llvm_tools_dir, config.environment['PATH']))
+    path = os.path.pathsep.join((fort_bin_dir, llvm_tools_dir, config.environment['PATH']))
     config.environment['PATH'] = path
 
     llvm_libs_dir = getattr(config, 'llvm_libs_dir', None)