Merge pull request #17681 from apple/enable-lldb-tests-linux-pr-tests

[Preset] Enable swift specific lldb test for PR testing

Author: shahmishal

utils/build-presets.ini

@@ -757,7 +757,7 @@ lit-args=-v
 dash-dash
 
 # rdar://problem/31454823
-skip-test-lldb
+lldb-test-swift-only
 
 install-foundation
 install-libdispatch