Revert r363298 "[lit] Disable test on darwin when building shared libs."

It broke running check-lld on mac, see https://reviews.llvm.org/D61697

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@363379 91177308-0d34-0410-b5e6-96231b3b80d8

utils/lit/lit/llvm/config.py

@@ -48,8 +48,6 @@ class LLVMConfig(object):
             # We should standardize on the former.
             features.add('system-linker-mach-o')
             features.add('system-darwin')
-            if config.enable_shared:
-                features.add("enable_shared")
         elif platform.system() == 'Windows':
             # For tests that require Windows to run.
             features.add('system-windows')