Revert "Add support for __builtin_os_log_format[_buffer_size]"

This reverts commit r284990, two opencl test are broken

llvm-svn: 285007
diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index 88dd6ce..ee995e0 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -2804,21 +2804,20 @@
 /// types.
 static FormatAttrKind getFormatAttrKind(StringRef Format) {
   return llvm::StringSwitch<FormatAttrKind>(Format)
-      // Check for formats that get handled specially.
-      .Case("NSString", NSStringFormat)
-      .Case("CFString", CFStringFormat)
-      .Case("strftime", StrftimeFormat)
+    // Check for formats that get handled specially.
+    .Case("NSString", NSStringFormat)
+    .Case("CFString", CFStringFormat)
+    .Case("strftime", StrftimeFormat)
 
-      // Otherwise, check for supported formats.
-      .Cases("scanf", "printf", "printf0", "strfmon", SupportedFormat)
-      .Cases("cmn_err", "vcmn_err", "zcmn_err", SupportedFormat)
-      .Case("kprintf", SupportedFormat)         // OpenBSD.
-      .Case("freebsd_kprintf", SupportedFormat) // FreeBSD.
-      .Case("os_trace", SupportedFormat)
-      .Case("os_log", SupportedFormat)
+    // Otherwise, check for supported formats.
+    .Cases("scanf", "printf", "printf0", "strfmon", SupportedFormat)
+    .Cases("cmn_err", "vcmn_err", "zcmn_err", SupportedFormat)
+    .Case("kprintf", SupportedFormat) // OpenBSD.
+    .Case("freebsd_kprintf", SupportedFormat) // FreeBSD.
+    .Case("os_trace", SupportedFormat)
 
-      .Cases("gcc_diag", "gcc_cdiag", "gcc_cxxdiag", "gcc_tdiag", IgnoredFormat)
-      .Default(InvalidFormat);
+    .Cases("gcc_diag", "gcc_cdiag", "gcc_cxxdiag", "gcc_tdiag", IgnoredFormat)
+    .Default(InvalidFormat);
 }
 
 /// Handle __attribute__((init_priority(priority))) attributes based on