[build-script] Re-enable lldb unit tests in PR testing.

This have been disabled because they were flakey, but now we
should have fixed the issues (or if there's something outstanding,
well, it's the right time to fix).

This is getting more important as we want to increase the set
of `lit/` or `unittest`-style testcases.

Author: Davide Italiano

utils/build-script-impl

@@ -2731,22 +2731,20 @@ for host in "${ALL_HOSTS[@]}"; do
                 fi
                 lldb_build_dir=$(build_directory ${host} lldb)
 
-                if [[ ! "${LLDB_TEST_SWIFT_ONLY}" ]]; then
-                    # Run the gtests.
-                    if [[ "$(uname -s)" == "Darwin" && "$(true_false ${LLDB_BUILD_WITH_XCODE})" == "TRUE" ]] ; then
-                        set_lldb_xcodebuild_options
-                        # Run the LLDB unittests (gtests).
-                        with_pushd ${LLDB_SOURCE_DIR} \
-                                   call xcodebuild -scheme lldb-gtest -configuration ${LLDB_BUILD_MODE} ${lldb_xcodebuild_options[@]}
-                        rc=$?
-                        if [[ "$rc" -ne 0 ]] ; then
-                            >&2 echo "error: LLDB gtests failed"
-                            exit 1
-                        fi
-                    else
-                        with_pushd ${lldb_build_dir} \
-                            ${NINJA_BIN} check-lldb-unit
+                # Run the gtests.
+                if [[ "$(uname -s)" == "Darwin" && "$(true_false ${LLDB_BUILD_WITH_XCODE})" == "TRUE" ]] ; then
+                    set_lldb_xcodebuild_options
+                    # Run the LLDB unittests (gtests).
+                    with_pushd ${LLDB_SOURCE_DIR} \
+                               call xcodebuild -scheme lldb-gtest -configuration ${LLDB_BUILD_MODE} ${lldb_xcodebuild_options[@]}
+                    rc=$?
+                    if [[ "$rc" -ne 0 ]] ; then
+                        >&2 echo "error: LLDB gtests failed"
+                        exit 1
                     fi
+                else
+                    with_pushd ${lldb_build_dir} \
+                        ${NINJA_BIN} check-lldb-unit
                 fi
 
                 swift_build_dir=$(build_directory ${host} swift)