8031115: intrinsics for Math.decrementExact(J) and incrementExact(J) don't work

Reviewed-by: kvn, twisti

src/share/vm/classfile/vmSymbols.hpp

@@ -654,9 +654,9 @@
   do_intrinsic(_addExactI,                java_lang_Math,         addExact_name, int2_int_signature,             F_S)   \
   do_intrinsic(_addExactL,                java_lang_Math,         addExact_name, long2_long_signature,           F_S)   \
   do_intrinsic(_decrementExactI,          java_lang_Math,         decrementExact_name, int_int_signature,        F_S)   \
-  do_intrinsic(_decrementExactL,          java_lang_Math,         decrementExact_name, long2_long_signature,     F_S)   \
+  do_intrinsic(_decrementExactL,          java_lang_Math,         decrementExact_name, long_long_signature,      F_S)   \
   do_intrinsic(_incrementExactI,          java_lang_Math,         incrementExact_name, int_int_signature,        F_S)   \
-  do_intrinsic(_incrementExactL,          java_lang_Math,         incrementExact_name, long2_long_signature,     F_S)   \
+  do_intrinsic(_incrementExactL,          java_lang_Math,         incrementExact_name, long_long_signature,      F_S)   \
   do_intrinsic(_multiplyExactI,           java_lang_Math,         multiplyExact_name, int2_int_signature,        F_S)   \
   do_intrinsic(_multiplyExactL,           java_lang_Math,         multiplyExact_name, long2_long_signature,      F_S)   \
   do_intrinsic(_negateExactI,             java_lang_Math,         negateExact_name, int_int_signature,           F_S)   \