Avoid gcc segmentation fault

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>

diff -Nur php-7.0.12.orig/Zend/zend_portability.h php-7.0.12/Zend/zend_portability.h
--- php-7.0.12.orig/Zend/zend_portability.h	2016-10-13 16:04:17.000000000 +0200
+++ php-7.0.12/Zend/zend_portability.h	2016-11-08 02:49:39.118388999 +0100
@@ -97,7 +97,7 @@
 
 #if defined(ZEND_WIN32) && !defined(__clang__)
 # define ZEND_ASSUME(c)	__assume(c)
-#elif ((defined(__GNUC__) && ZEND_GCC_VERSION >= 4005) || __has_builtin(__builtin_unreachable)) && PHP_HAVE_BUILTIN_EXPECT
+#elif ((defined(__GNUC__) && ZEND_GCC_VERSION >= 4005) || __has_builtin(__builtin_unreachable)) && PHP_HAVE_BUILTIN_EXPECT && !defined(__bfin__)
 # define ZEND_ASSUME(c)	do { \
 		if (__builtin_expect(!(c), 0)) __builtin_unreachable(); \
 	} while (0)