[11] RFR(S): 8202848: -XX:+ExecuteInternalVMTests asserts with "assert(cd.valid() == true) failed: failed on a valid DirectivesParser string"

[Tobias Hartmann]

Hi,

please review the following patch:
https://bugs.openjdk.java.net/browse/JDK-8202848
http://cr.openjdk.java.net/~thartmann/8202848/webrev.00/

The problem is that with some locale settings (for example, LC_NUMERIC = de_DE.UTF-8), sscanf in
JSON::parse_json_number() treats "," as the decimal separator instead of ".". As a result, the value
of "VectorizeDebug: 1," in one of the DirectivesParser tests is read as "1," and we skip the comma
at the end of the line.

This only affects VM internal tests, directive files specified via -XX:CompilerDirectivesFile= are
parsed before the locale is set to the systems default. We should therefore explicitly set the "C"
locale for the VM internal DirectivesParser tests.

Thanks,
Tobias