Update templight pseudo-release to remove need for patching (#10290)

* Update templight+LLVM combo

* Bring back old pseudo-release

var/spack/repos/builtin/packages/templight/package.py

@@ -37,8 +37,22 @@ class Templight(CMakePackage):
 
     # Templight has no stable release yet, and is supposed to be built against
     # the LLVM trunk. As this is a brittle combination, I decided to
-    # artificially create a stable release based on what works today. Please
-    # feel free to remove this version once templight has stabilized.
+    # artificially create stable releases based on what works today. Please
+    # feel free to remove these versions once templight has stabilized.
+    version('2019.01.09', commit='0899a4345607f1bb244cae477214f274ad2c52cc')
+    resource(name='llvm-r350726',
+             svn=llvm_svn.format('llvm'),
+             revision=350726,
+             destination='.',
+             placement='llvm',
+             when='@2019.01.09')
+    resource(name='clang-r350726',
+             svn=llvm_svn.format('cfe'),
+             revision=350726,
+             destination='llvm/tools',
+             placement='clang',
+             when='@2019.01.09')
+
     version('2018.07.20', commit='91589f95427620dd0a2346bd69ba922f374aa42a')
     resource(name='llvm-r337566',
              svn=llvm_svn.format('llvm'),