[clang-format] clang-format off/on not respected when using C Style comments

Summary:
If the clang-format on/off is in a /* comment */ then the sorting of headers is not ignored

PR40901 - https://bugs.llvm.org/show_bug.cgi?id=40901

Reviewers: djasper, klimek, JonasToth, krasimir, alexfh

Reviewed By: alexfh

Subscribers: alexfh, cfe-commits, llvm-commits

Tags: #clang, #clang-tools-extra

Differential Revision: https://reviews.llvm.org/D58819

llvm-svn: 355266
diff --git a/clang/lib/Format/Format.cpp b/clang/lib/Format/Format.cpp
index a5023ec..a56fed9 100644
--- a/clang/lib/Format/Format.cpp
+++ b/clang/lib/Format/Format.cpp
@@ -1786,9 +1786,10 @@
         Code.substr(Prev, (Pos != StringRef::npos ? Pos : Code.size()) - Prev);
 
     StringRef Trimmed = Line.trim();
-    if (Trimmed == "// clang-format off")
+    if (Trimmed == "// clang-format off" || Trimmed == "/* clang-format off */")
       FormattingOff = true;
-    else if (Trimmed == "// clang-format on")
+    else if (Trimmed == "// clang-format on" ||
+             Trimmed == "/* clang-format on */")
       FormattingOff = false;
 
     const bool EmptyLineSkipped =