diff --git a/tools/clang/scripts/update.py b/tools/clang/scripts/update.py
index f612e6c..c3d36eb 100755
--- a/tools/clang/scripts/update.py
+++ b/tools/clang/scripts/update.py
@@ -27,7 +27,7 @@
 # Do NOT CHANGE this if you don't know what you're doing -- see
 # https://chromium.googlesource.com/chromium/src/+/master/docs/updating_clang.md
 # Reverting problematic clang rolls is safe, though.
-CLANG_REVISION = '346388'
+CLANG_REVISION = '350768'
 
 use_head_revision = bool(os.environ.get('LLVM_FORCE_HEAD_REVISION', '0')
                          in ('1', 'YES'))
@@ -35,7 +35,7 @@
   CLANG_REVISION = 'HEAD'
 
 # This is incremented when pushing a new build of Clang at the same revision.
-CLANG_SUB_REVISION=5
+CLANG_SUB_REVISION=1
 
 PACKAGE_VERSION = "%s-%s" % (CLANG_REVISION, CLANG_SUB_REVISION)
 
@@ -347,7 +347,7 @@
     return
 
   gnuwin_dir = os.path.join(LLVM_BUILD_TOOLS_DIR, 'gnuwin')
-  GNUWIN_VERSION = '8'
+  GNUWIN_VERSION = '9'
   GNUWIN_STAMP = os.path.join(gnuwin_dir, 'stamp')
   if ReadStampFile(GNUWIN_STAMP) == GNUWIN_VERSION:
     print 'GNU Win tools already up to date.'
@@ -384,6 +384,7 @@
     '2013': 'msdia120.dll',
     '2015': 'msdia140.dll',
     '2017': 'msdia140.dll',
+    '2019': 'msdia140.dll',
   }
 
   # Don't let vs_toolchain overwrite our environment.
@@ -531,6 +532,7 @@
                      '-DLLVM_ENABLE_TERMINFO=OFF',
                      # Statically link MSVCRT to avoid DLL dependencies.
                      '-DLLVM_USE_CRT_RELEASE=MT',
+                     '-DCLANG_PLUGIN_SUPPORT=OFF',
                      ]
 
   if sys.platform != 'win32':
@@ -828,25 +830,20 @@
         '-DANDROID=1']
       RmCmakeCache('.')
       RunCommand(['cmake'] + android_args + [COMPILER_RT_DIR])
-      RunCommand(['ninja', 'asan', 'ubsan', 'profile'])
+
+      # We use ASan i686 build for fuzzing.
+      libs_want = ['lib/linux/libclang_rt.asan-{0}-android.so']
+      if target_arch in ['aarch64', 'arm']:
+        libs_want += [
+            'lib/linux/libclang_rt.ubsan_standalone-{0}-android.so',
+            'lib/linux/libclang_rt.profile-{0}-android.a',
+        ]
+      libs_want = [lib.format(target_arch) for lib in libs_want]
+      RunCommand(['ninja'] + libs_want)
 
       # And copy them into the main build tree.
-      asan_lib_path_format = 'lib/linux/libclang_rt.asan-{0}-android.so'
-      libs_want = [
-          asan_lib_path_format,
-          'lib/linux/libclang_rt.ubsan_standalone-{0}-android.so',
-          'lib/linux/libclang_rt.profile-{0}-android.a',
-      ]
-      for arch in ['aarch64', 'arm']:
-        for p in libs_want:
-          lib_path = os.path.join(build_dir, p.format(arch))
-          if os.path.exists(lib_path):
-            shutil.copy(lib_path, rt_lib_dst_dir)
-
-      # We also use ASan i686 build for fuzzing.
-      lib_path = os.path.join(build_dir, asan_lib_path_format.format('i686'))
-      if os.path.exists(lib_path):
-        shutil.copy(lib_path, rt_lib_dst_dir)
+      for p in libs_want:
+        shutil.copy(p, rt_lib_dst_dir)
 
   if args.with_fuchsia:
     # Fuchsia links against libclang_rt.builtins-<arch>.a instead of libgcc.a.
@@ -927,9 +924,6 @@
   parser = argparse.ArgumentParser(description='Build Clang.')
   parser.add_argument('--bootstrap', action='store_true',
                       help='first build clang with CC, then with itself.')
-  # TODO(phajdan.jr): remove --if-needed after fixing callers. It's no-op.
-  parser.add_argument('--if-needed', action='store_true',
-                      help="run only if the script thinks clang is needed")
   parser.add_argument('--force-local-build', action='store_true',
                       help="don't try to download prebuild binaries")
   parser.add_argument('--gcc-toolchain', help='set the version for which gcc '