Patch for LLVM to build under DragonFly

llvm.dfly.patch

diff --git a/include/llvm/Analysis/BlockFrequencyImpl.h b/include/llvm/Analysis/BlockFrequencyImpl.h
index 817a441..cbbd934 100644
--- a/include/llvm/Analysis/BlockFrequencyImpl.h
+++ b/include/llvm/Analysis/BlockFrequencyImpl.h
@@ -235,8 +235,9 @@ class BlockFrequencyImpl {
     //
     //   Iterations = 1 / ExitProb
     //
-    uint64_t D = std::max(getBlockFreq(Head).getFrequency(), UINT64_C(1));
-    uint64_t N = std::max(BackFreq.getFrequency(), UINT64_C(1));
+    uint64_t one = UINT64_C(1);
+    uint64_t D = std::max(getBlockFreq(Head).getFrequency(), one);
+    uint64_t N = std::max(BackFreq.getFrequency(), one);
     if (N < D)
       N = D - N;
     else