[sanitizer_common] Add SANITIZER_FUCHSIA

[mcgrathr]

Summary

More changes to follow will add the Fuchsia port.

[mcgrathr]

Please land it for me.

Thanks,
Roland

compiler-rt/trunk/lib/sanitizer_common/sanitizer_platform.h

 //===-- sanitizer_platform.h ------------------------------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // Common platform macros.
 //===----------------------------------------------------------------------===//
 
 #ifndef SANITIZER_PLATFORM_H
 #define SANITIZER_PLATFORM_H
 
 #if !defined(__linux__) && !defined(__FreeBSD__) && !defined(__NetBSD__) && \
-  !defined(__APPLE__) && !defined(_WIN32)
+  !defined(__APPLE__) && !defined(_WIN32) && !defined(__Fuchsia__)
 # error "This operating system is not supported"
 #endif
 
 #if defined(__linux__)
 # define SANITIZER_LINUX   1
 #else
 # define SANITIZER_LINUX   0
 #endif

 #endif
 
 #if defined(__ANDROID__)
 # define SANITIZER_ANDROID 1
 #else
 # define SANITIZER_ANDROID 0
 #endif
 
+#if defined(__Fuchsia__)
+# define SANITIZER_FUCHSIA 1
+#else
+# define SANITIZER_FUCHSIA 0
+#endif
+
 #define SANITIZER_POSIX \
   (SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_MAC || SANITIZER_NETBSD)
 
 #if __LP64__ || defined(_WIN64)
 #  define SANITIZER_WORDSIZE 64
 #else
 #  define SANITIZER_WORDSIZE 32
 #endif