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

[Severin Gehwolf]

Hi Foivos,

On Wed, 2020-07-01 at 15:12 +0300, Foivos Zakkak wrote:
> Hello all,
> 
> I am attaching a backport
> https://bugs.openjdk.java.net/browse/JDK-8247246 to jdk11u-dev.

For reference, this is the original change in JDK 15:
https://hg.openjdk.java.net/jdk/jdk15/rev/b58fc6058055

> 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

src/hotspot/share/jvmci/jvmciCompilerToVM.cpp

The original change didn't include a copyright update. So should the
backport.

This actually applies to all files touched.

Thanks,
Severin

> Thanks,
> Foivos Zakkak
> 
> PS: Pretty happy to submit my first contribution to OpenJDK
>