[11u] RFR: backport JDK-8247246: Add explicit ResolvedJavaType.link and expose, presence of default methods

[Foivos Zakkak]

Hello all,

I am attaching a backport
https://bugs.openjdk.java.net/browse/JDK-8247246 to jdk11u-dev.

This backport fixes https://github.com/oracle/graal/issues/2628

The backport applied cleanly except for some minor issues which I
resolved by changing:

JVMCI_THROW(NullPointerException);
to
THROW(vmSymbols::java_lang_NullPointerException());

and

Klass* klass = JVMCIENV->asKlass(jvmci_type);
to
Klass* klass = CompilerToVM::asKlass(jvmci_type);


The backport has been successfully tested using:

make run-test TEST="hotspot/jtreg/compiler/jvmci"
make run-test-tier1

I have also successfully built graal master against the patched JDK

Thanks,
Foivos Zakkak

PS: Pretty happy to submit my first contribution to OpenJDK

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