Replace our home-grown BitCast with bit_cast from Chrome/Google3.

test/cctest/test-macro-assembler-mips.cc

Index: test/cctest/test-macro-assembler-mips.cc
diff --git a/test/cctest/test-macro-assembler-mips.cc b/test/cctest/test-macro-assembler-mips.cc
index 33a4611540f427cb800d1a60ded88c47f0a93391..3674bfbca6aaae8446167e70c284f933b92c20b5 100644
--- a/test/cctest/test-macro-assembler-mips.cc
+++ b/test/cctest/test-macro-assembler-mips.cc
@@ -149,9 +149,9 @@ static void TestNaN(const char *code) {
   i::FixedDoubleArray* a = i::FixedDoubleArray::cast(array1->elements());
   double value = a->get_scalar(0);
   CHECK(std::isnan(value) &&
-        i::BitCast<uint64_t>(value) ==
-        i::BitCast<uint64_t>(
-            i::FixedDoubleArray::canonical_not_the_hole_nan_as_double()));
+        i::bit_cast<uint64_t>(value) ==
+            i::bit_cast<uint64_t>(
+                i::FixedDoubleArray::canonical_not_the_hole_nan_as_double()));
 }