Replace 'grep foo | count 0' with 'not grep foo'.

This avoids depending on pipefail not being used.

llvm-svn: 185648
diff --git a/clang/test/Frontend/darwin-version.c b/clang/test/Frontend/darwin-version.c
index f9ce54b..7234ab4 100644
--- a/clang/test/Frontend/darwin-version.c
+++ b/clang/test/Frontend/darwin-version.c
@@ -1,23 +1,23 @@
 // RUN: %clang -target armv6-apple-darwin9 -dM -E -o %t %s
-// RUN: grep '__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__' %t | count 0
+// RUN: not grep '__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__' %t
 // RUN: grep '__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__' %t | grep '1050' | count 1
 // RUN: %clang -target armv6-apple-darwin9 -miphoneos-version-min=3.0 -dM -E -o %t %s
 // RUN: grep '__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__' %t | grep '30000' | count 1
-// RUN: grep '__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__' %t | count 0
+// RUN: not grep '__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__' %t
 // RUN: %clang -target armv6-apple-darwin9 -miphoneos-version-min=2.0 -dM -E -o %t %s
 // RUN: grep '__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__' %t | grep '20000' | count 1
-// RUN: grep '__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__' %t | count 0
+// RUN: not grep '__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__' %t
 // RUN: %clang -target armv6-apple-darwin9 -miphoneos-version-min=2.2 -dM -E -o %t %s
 // RUN: grep '__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__' %t | grep '20200' | count 1
 // RUN: %clang -target i686-apple-darwin8 -dM -E -o %t %s
-// RUN: grep '__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__' %t | count 0
+// RUN: not grep '__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__' %t
 // RUN: grep '__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__' %t | grep '1040' | count 1
 // RUN: %clang -target i686-apple-darwin9 -dM -E -o %t %s
 // RUN: grep '__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__' %t | grep '1050' | count 1
 // RUN: %clang -target i686-apple-darwin10 -dM -E -o %t %s
 // RUN: grep '__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__' %t | grep '1060' | count 1
 // RUN: %clang -target i686-apple-darwin9 -mmacosx-version-min=10.4 -dM -E -o %t %s
-// RUN: grep '__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__' %t | count 0
+// RUN: not grep '__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__' %t
 // RUN: grep '__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__' %t | grep '1040' | count 1
 // RUN: %clang -target i686-apple-darwin9 -mmacosx-version-min=10.5 -dM -E -o %t %s
 // RUN: grep '__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__' %t | grep '1050' | count 1