RFR(S): JDK-8247938: Change various JVM enums like LinkInfo::AccessCheck and Klass::DefaultsLookupMode to enum class

[Lois Foltan]

Thank you Harold & Coleen for the review!
Lois

On 7/31/2020 2:50 PM, coleen.phillimore at oracle.com wrote:
> Yes, I agree. This looks good!
> Coleen
>
> On 7/31/20 1:55 PM, Lois Foltan wrote:
>> Please review the webrev to change the following unscoped enumeration 
>> declarations to scoped enumerations.
>>
>> Klass::DefaultsLookupMode
>> Klass::OverpassLookupMode
>> Klass::StaticLookupMode
>> Klass::PrivateLookupMode
>> LinkInfo::AccessCheck
>>
>> With C++11/14 enum class provides the added type safety to prevent 0 
>> (integral) or false (boolean) to be implicitly converted to 
>> AccessCheck::needs_access_check for example.
>>
>> open webrev 
>> at:http://cr.openjdk.java.net/~lfoltan/bug_jdk8247938.0/webrev/ 
>> <http://cr.openjdk.java.net/~lfoltan/bug_jdk8247938.0/webrev/index.html>
>> bug link: https://bugs.openjdk.java.net/browse/JDK-8247938
>>
>> Testing: hs-tier1 & 2 complete, hs-tier3-6 in progress
>>
>> Thanks,
>> Lois
>