configure: Provide symlink for amdgcn-mesa3d instead of configure hack

Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>
Reviewed-By: Aaron Watry <awatry@gmail.com>
llvm-svn: 346085

libclc/amdgcn-mesa3d

@@ -0,0 +1 @@
+amdgcn-amdhsa

libclc/configure.py

@@ -187,8 +187,6 @@ for target in targets:
   for arch in archs:
     subdirs.append("%s-%s-%s" % (arch, t_vendor, t_os))
     subdirs.append("%s-%s" % (arch, t_os))
-    if t_os == 'mesa3d':
-        subdirs.append('amdgcn-amdhsa')
     subdirs.append(arch)
     if arch == 'amdgcn' or arch == 'r600':
         subdirs.append('amdgpu')