[Fuchsia] Magenta -> Zircon

Fuchsia's lowest API layer has been renamed from Magenta to Zircon.

Patch by Roland McGrath

Differential Revision: https://reviews.llvm.org/D37770

llvm-svn: 313106
diff --git a/compiler-rt/lib/interception/interception.h b/compiler-rt/lib/interception/interception.h
index 9e65ffa..9534984 100644
--- a/compiler-rt/lib/interception/interception.h
+++ b/compiler-rt/lib/interception/interception.h
@@ -152,7 +152,7 @@
 // There is no general interception at all on Fuchsia.
 // Sanitizer runtimes just define functions directly to preempt them,
 // and have bespoke ways to access the underlying libc functions.
-# include <magenta/sanitizer.h>
+# include <zircon/sanitizer.h>
 # define INTERCEPTOR_ATTRIBUTE __attribute__((visibility("default")))
 # define REAL(x) __unsanitized_##x
 # define DECLARE_REAL(ret_type, func, ...)