RFR(S) 8178118: Arguments::create_numbered_property allocates wrong buffer in case count > 99

[Ekaterina Pavlova]

Hi everyone,

Please review this change that fixes memory allocation in Arguments::create_numbered_property.
Also added error messages so java prints some hints except just exiting with "Error: Could not create the Java Virtual Machine"
(tested by adding error in 'prop_len' calculation).
This is perhaps zero day bug but it was recently discovered when testing with multiple '-add-exports' options.

   bug: https://bugs.openjdk.java.net/browse/JDK-8178118
webrev:  http://cr.openjdk.java.net/~iignatyev/epavlova/8178118/

Tested by running jprt.

-katya