Revert "[bazel] Undo LSP changes after revert (llvm#157691)"

This reverts commit 35d47fb.

Author: jtstogel

utils/bazel/llvm-project-overlay/llvm/BUILD.bazel

@@ -228,6 +228,7 @@ cc_library(
         "lib/Support/*.cpp",
         "lib/Support/*.h",
         "lib/Support/*.inc",
+        "lib/Support/LSP/*.cpp",
         # To avoid a dependency cycle.
         "include/llvm/Option/*.h",
     ]) + select({

utils/bazel/llvm-project-overlay/llvm/unittests/BUILD.bazel

@@ -793,6 +793,23 @@ cc_test(
     ],
 )
 
+cc_test(
+    name = "SupportLSPTests",
+    size = "small",
+    srcs = glob(["Support/LSP/*.cpp"]),
+    copts = [
+        "$(STACK_FRAME_UNLIMITED)",
+    ],
+    linkstatic = 1,
+    deps = [
+        "//llvm:Support",
+        "//llvm:config",
+        "//third-party/unittest:gmock",
+        "//third-party/unittest:gtest",
+        "//third-party/unittest:gtest_main",
+    ],
+)
+
 cc_test(
     name = "tablegen_tests",
     size = "small",