Prepare to build clang-r475365

Allow single-bit-bitfield-constant-conversion warnings to pass
with r475365.

Bug: 253033919
Test: run test_compiler.py
Change-Id: Icc1f1c6c013418f1e5bb839ef70ebe8498b9cedc
diff --git a/cc/config/global.go b/cc/config/global.go
index e6b9459..cf60414 100644
--- a/cc/config/global.go
+++ b/cc/config/global.go
@@ -293,10 +293,8 @@
 	}
 
 	llvmNextExtraCommonGlobalCflags = []string{
-		// New warnings to be fixed after clang-r468909
-		"-Wno-error=array-parameter",     // http://b/241941550
-		"-Wno-error=deprecated-builtins", // http://b/241601211
-		"-Wno-error=deprecated",          // in external/googletest/googletest
+		// New warnings to be fixed after clang-r475365
+		"-Wno-error=single-bit-bitfield-constant-conversion", // http://b/243965903
 	}
 
 	IllegalFlags = []string{