Import Cobalt 19.master.0.203780

Includes the following patches:
  https://cobalt-review.googlesource.com/c/cobalt/+/5210
    by errong.leng@samsung.com
  https://cobalt-review.googlesource.com/c/cobalt/+/5270
    by linus.wang@samsung.com

src/third_party/llvm-project/clang/test/Unit/lit.cfg.py

diff --git a/src/third_party/llvm-project/clang/test/Unit/lit.cfg.py b/src/third_party/llvm-project/clang/test/Unit/lit.cfg.py
new file mode 100644
index 0000000..342b692
--- /dev/null
+++ b/src/third_party/llvm-project/clang/test/Unit/lit.cfg.py
@@ -0,0 +1,57 @@
+# -*- Python -*-
+
+# Configuration file for the 'lit' test runner.
+
+import os
+import platform
+import subprocess
+
+import lit.formats
+import lit.util
+
+# name: The name of this test suite.
+config.name = 'Clang-Unit'
+
+# suffixes: A list of file extensions to treat as test files.
+config.suffixes = []
+
+# test_source_root: The root path where tests are located.
+# test_exec_root: The root path where tests should be run.
+config.test_exec_root = os.path.join(config.clang_obj_root, 'unittests')
+config.test_source_root = config.test_exec_root
+
+# testFormat: The test format to use to interpret tests.
+config.test_format = lit.formats.GoogleTest(config.llvm_build_mode, 'Tests')
+
+# Propagate the temp directory. Windows requires this because it uses \Windows\
+# if none of these are present.
+if 'TMP' in os.environ:
+    config.environment['TMP'] = os.environ['TMP']
+if 'TEMP' in os.environ:
+    config.environment['TEMP'] = os.environ['TEMP']
+
+# Propagate path to symbolizer for ASan/MSan.
+for symbolizer in ['ASAN_SYMBOLIZER_PATH', 'MSAN_SYMBOLIZER_PATH']:
+    if symbolizer in os.environ:
+        config.environment[symbolizer] = os.environ[symbolizer]
+
+def find_shlibpath_var():
+    if platform.system() in ['Linux', 'FreeBSD', 'NetBSD', 'SunOS']:
+        yield 'LD_LIBRARY_PATH'
+    elif platform.system() == 'Darwin':
+        yield 'DYLD_LIBRARY_PATH'
+    elif platform.system() == 'Windows':
+        yield 'PATH'
+
+for shlibpath_var in find_shlibpath_var():
+    # in stand-alone builds, shlibdir is clang's build tree
+    # while llvm_libs_dir is installed LLVM (and possibly older clang)
+    shlibpath = os.path.pathsep.join(
+        (config.shlibdir,
+         config.llvm_libs_dir,
+         config.environment.get(shlibpath_var, '')))
+    config.environment[shlibpath_var] = shlibpath
+    break
+else:
+    lit_config.warning("unable to inject shared library path on '{}'"
+                       .format(platform.system()))

src/third_party/llvm-project/clang/test/Unit/lit.site.cfg.py.in

diff --git a/src/third_party/llvm-project/clang/test/Unit/lit.site.cfg.py.in b/src/third_party/llvm-project/clang/test/Unit/lit.site.cfg.py.in
new file mode 100644
index 0000000..715b4d9
--- /dev/null
+++ b/src/third_party/llvm-project/clang/test/Unit/lit.site.cfg.py.in
@@ -0,0 +1,28 @@
+@LIT_SITE_CFG_IN_HEADER@
+
+import sys
+
+config.llvm_src_root = "@LLVM_SOURCE_DIR@"
+config.llvm_obj_root = "@LLVM_BINARY_DIR@"
+config.llvm_tools_dir = "@LLVM_TOOLS_DIR@"
+config.llvm_libs_dir = "@LLVM_LIBS_DIR@"
+config.llvm_build_mode = "@LLVM_BUILD_MODE@"
+config.clang_obj_root = "@CLANG_BINARY_DIR@"
+config.enable_shared = @ENABLE_SHARED@
+config.shlibdir = "@SHLIBDIR@"
+config.target_triple = "@TARGET_TRIPLE@"
+
+# Support substitution of the tools_dir, libs_dirs, and build_mode with user
+# parameters. This is used when we can't determine the tool dir at
+# configuration time.
+try:
+    config.llvm_tools_dir = config.llvm_tools_dir % lit_config.params
+    config.llvm_libs_dir = config.llvm_libs_dir % lit_config.params
+    config.llvm_build_mode = config.llvm_build_mode % lit_config.params
+except KeyError:
+    e = sys.exc_info()[1]
+    key, = e.args
+    lit_config.fatal("unable to find %r parameter, use '--param=%s=VALUE'" % (key,key))
+
+# Let the main config do the real work.
+lit_config.load_config(config, "@CLANG_SOURCE_DIR@/test/Unit/lit.cfg.py")