Roll clang 295793:296320.

Ran `tools/clang/scripts/upload_revision.py 296320`.

BUG=696607,695113

Review-Url: https://codereview.chromium.org/2720793002
Cr-Commit-Position: refs/heads/master@{#453392}
diff --git a/tools/clang/scripts/update.py b/tools/clang/scripts/update.py
index 4d64ec16..2dfef6f 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 = '295793'
+CLANG_REVISION = '296320'
 
 use_head_revision = 'LLVM_FORCE_HEAD_REVISION' in os.environ
 if use_head_revision: