Reland "Initial switch to Chromium-style CHECK_* and DCHECK_* macros.".

test/cctest/compiler/codegen-tester.h

Index: test/cctest/compiler/codegen-tester.h
diff --git a/test/cctest/compiler/codegen-tester.h b/test/cctest/compiler/codegen-tester.h
index 18903fd85ef0e604c93b22bc2b652b3cb93234f3..d45d1fdc3322fc279185e54b0c2b0be44af15ff7 100644
--- a/test/cctest/compiler/codegen-tester.h
+++ b/test/cctest/compiler/codegen-tester.h
@@ -332,6 +332,16 @@ class Int32BinopInputShapeTester {
   void RunLeft(RawMachineAssemblerTester<int32_t>* m);
   void RunRight(RawMachineAssemblerTester<int32_t>* m);
 };
+
+// TODO(bmeurer): Drop this crap once we switch to GTest/Gmock.
+static inline void CheckDoubleEq(volatile double x, volatile double y) {
+  if (std::isnan(x)) {
+    CHECK(std::isnan(y));
+  } else {
+    CHECK_EQ(x, y);
+  }
+}
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8