[foreign-memaccess+abi] RFR: Micro optimizations and tidy

[Per Minborg]

On Fri, 19 Aug 2022 08:29:23 GMT, Per Minborg <duke at openjdk.org> wrote:

>> src/java.base/share/classes/java/lang/foreign/FunctionDescriptor.java line 108:
>> 
>>> 106:     public FunctionDescriptor asVariadic(MemoryLayout... variadicLayouts) {
>>> 107:         assertVarargsNonNull(variadicLayouts);
>>> 108:         return variadicLayouts.length == 0 ? this : new VariadicFunction(this, variadicLayouts);
>> 
>> We could change the VariadicFunction constructor to accept a List of non-null elements.
>
> It already throws an NPE if any of the args or variadicLayouts elements are `null`. So, the check is redundant also here.

Well, it turned out it didn't. But soon it will...

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PR: https://git.openjdk.org/panama-foreign/pull/708