Add missing header <atomic> in lib/IR/Verifier.cpp (NFC)

Fix the build on some platform.

diff --git a/mlir/lib/IR/Verifier.cpp b/mlir/lib/IR/Verifier.cpp
index 700e50425e88d0edc606029552e75dde0bed7b46..ffb8236ffc7012d665a20123b6f3881608dfaf15 100644 (file)
--- a/mlir/lib/IR/Verifier.cpp
+++ b/mlir/lib/IR/Verifier.cpp
@@ -34,6 +34,8 @@
 #include "llvm/Support/Parallel.h"
 #include "llvm/Support/PrettyStackTrace.h"
 
+#include <atomic>
+
 using namespace mlir;
 
 namespace {