Export of internal Abseil changes

--
2dd3b23ea940804de727e396b300cfae4b1b71a1 by Derek Mauro <dmauro@google.com>:

Upgrade to LLVM r366207 and Bazel 0.28.1 for Linux-Clang testing.

PiperOrigin-RevId: 263162761

--
f03ae9e4e9f42c075745d28b4ced78071e73724a by Derek Mauro <dmauro@google.com>:

Remove unneeded dependencies on //absl/base from targets that no
longer depend on it.

PiperOrigin-RevId: 263129193

--
8ec2aab1eea50e7f71a6a687a07e5ae0e0945f5e by Derek Mauro <dmauro@google.com>:

Move raw_logging to a separate target (raw_logging_internal)

PiperOrigin-RevId: 262972007
GitOrigin-RevId: 2dd3b23ea940804de727e396b300cfae4b1b71a1
Change-Id: I3f4580e87797386b0b5e90c8ced74cbf078f61c1

absl/flags/BUILD.bazel

@@ -97,8 +97,8 @@ cc_library(
     deps = [
         ":config",
         ":marshalling",
-        "//absl/base",
         "//absl/base:core_headers",
+        "//absl/base:raw_logging_internal",
         "//absl/strings",
         "//absl/synchronization",
         "//absl/types:optional",
@@ -123,9 +123,9 @@ cc_library(
     deps = [
         ":config",
         ":handle",
-        "//absl/base",
         "//absl/base:core_headers",
         "//absl/base:dynamic_annotations",
+        "//absl/base:raw_logging_internal",
         "//absl/strings",
         "//absl/synchronization",
     ],
@@ -306,7 +306,7 @@ cc_test(
     deps = [
         ":flag",
         ":parse",
-        "//absl/base",
+        "//absl/base:raw_logging_internal",
         "//absl/base:scoped_set_env",
         "//absl/strings",
         "//absl/types:span",

absl/flags/CMakeLists.txt

@@ -84,11 +84,11 @@ absl_cc_library(
   DEPS
     absl::flags_config
     absl::flags_marshalling
-    absl::base
     absl::core_headers
+    absl::optional
+    absl::raw_logging_internal
     absl::strings
     absl::synchronization
-    absl::optional
 )
 
 # Internal-only target, do not depend on directly.
@@ -108,9 +108,9 @@ absl_cc_library(
   DEPS
     absl::flags_config
     absl::flags_handle
-    absl::base
     absl::core_headers
     absl::dynamic_annotations
+    absl::raw_logging_internal
     absl::strings
     absl::synchronization
 )
@@ -265,8 +265,8 @@ absl_cc_test(
     ${ABSL_TEST_COPTS}
   DEPS
     absl::flags
-    absl::base
     absl::flags_parse
+    absl::raw_logging_internal
     absl::scoped_set_env
     absl::span
     absl::strings