Mark cctests that don't use deprecated APIs as such

test/cctest/test-dtoa.cc

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+// TODO(jochen): Remove this after the setting is turned on globally.
+#define V8_IMMINENT_DEPRECATION_WARNINGS
+
 #include <stdlib.h>
 
 #include "src/v8.h"
 
 #include "src/dtoa.h"
 
 #include "src/base/platform/platform.h"
 #include "src/double.h"
 #include "test/cctest/cctest.h"
 #include "test/cctest/gay-fixed.h"
@@ skipping 284 matching lines @@
     int number_digits = current_test.number_digits;
     DoubleToAscii(v, DTOA_PRECISION, number_digits,
                   buffer, &sign, &length, &point);
     CHECK_EQ(0, sign);  // All precomputed numbers are positive.
     CHECK_EQ(current_test.decimal_point, point);
     CHECK_GE(number_digits, length);
     TrimRepresentation(buffer);
     CHECK_EQ(0, strcmp(current_test.representation, buffer.start()));
   }
 }