PNaCl: Add "not" to various test commands, to pass under LLVM 3.4

test/NaCl/PNaClABI/abi-flattened-globals.ll

-; RUN: pnacl-abicheck < %s | FileCheck %s
+; RUN: not pnacl-abicheck < %s | FileCheck %s
 
 
 ; Allowed cases
 
 @bytes = internal global [7 x i8] c"abcdefg"
 
 @ptr_to_ptr = internal global i32 ptrtoint (i32* @ptr to i32)
 @ptr_to_func = internal global i32 ptrtoint (void ()* @func to i32)
 
 @compound = internal global <{ [3 x i8], i32 }>
@@ skipping 48 matching lines @@
 ; The struct type must be anonymous.
 %struct = type <{ [3 x i8], i32 }>
 @named_struct = internal global %struct
     <{ [3 x i8] c"foo", i32 ptrtoint (void ()* @func to i32) }>
 ; CHECK: Global variable named_struct has non-flattened initializer
 
 
 define internal void @func() {
   ret void
 }