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

test/cctest/test-code-stubs.cc

Index: test/cctest/test-code-stubs.cc
diff --git a/test/cctest/test-code-stubs.cc b/test/cctest/test-code-stubs.cc
index 03af8897045a265b4192aedc8e792f3fbf2202d0..95035aab0bd53197cf7d35b2f9c9c653a0737f0c 100644
--- a/test/cctest/test-code-stubs.cc
+++ b/test/cctest/test-code-stubs.cc
@@ -62,7 +62,7 @@ int STDCALL ConvertDToICVersion(double d) {
     }
   } else {
     uint64_t big_result =
-        (BitCast<uint64_t>(d) & Double::kSignificandMask) | Double::kHiddenBit;
+        (bit_cast<uint64_t>(d) & Double::kSignificandMask) | Double::kHiddenBit;
     big_result = big_result >> (Double::kPhysicalSignificandSize - exponent);
     result = static_cast<uint32_t>(big_result);
   }