In official builds, let CHECK(false) crash instead of calling BreakDebugger.

base/logging.h

Index: base/logging.h
diff --git a/base/logging.h b/base/logging.h
index 36c9c6f311d1615b98c7507235e0bb41ec68e4b1..0476a4450fb09453db113b38e59b71b5ff226fec 100644
--- a/base/logging.h
+++ b/base/logging.h
@@ -453,11 +453,17 @@ class CheckOpResult {
 // Make all CHECK functions discard their log strings to reduce code
 // bloat, and improve performance, for official release builds.
 
-// TODO(akalin): This would be more valuable if there were some way to
-// remove BreakDebugger() from the backtrace, perhaps by turning it
-// into a macro (like __debugbreak() on Windows).
+#if defined(COMPILER_GCC) || __clang__
+#define LOGGING_CRASH() __builtin_trap()
+#else
+#define LOGGING_CRASH() ((void)(*(volatile char*)0 = 0))
+#endif
+
+// This is not calling BreakDebugger since this is called frequently, and
+// calling an out-of-line function instead of a noreturn inline macro prevents
+// compiler optimizations.
 #define CHECK(condition)                                                \
-  !(condition) ? ::base::debug::BreakDebugger() : EAT_STREAM_PARAMETERS
+  !(condition) ? LOGGING_CRASH() : EAT_STREAM_PARAMETERS
 
 #define PCHECK(condition) CHECK(condition)