RFR: 8366495: Incorrect minimum memory size allocated in allocateNativeInternal()

[Amit Kumar]

Originally Reported in OpenJ9, fix by @AditiS11 present here: https://github.com/ibmruntimes/openj9-openjdk-jdk25/pull/32

These test failure were reported in OpenJ9 (x86), I can't reproduce on my system (s390x): 

java/foreign/TestFill.java
java/foreign/TestSegments.java
java/foreign/TestSegmentBulkOperationsContentHash.java
java/foreign/TestStringEncoding.java
java/foreign/TestVarArgs.java



```java 
        // Always allocate at least some memory so that zero-length segments have distinct
        // non-zero addresses.
        alignedSize = Math.max(1, alignedSize);


Here minimum-allocated size will be 1, which is incorrect because 


    private static void initNativeMemory(long address, long byteSize) {
        for (long i = 0; i < byteSize; i += Long.BYTES) {
            UNSAFE.putLongUnaligned(null, address + i, 0);
        }
    }

`initNativeMemory()` is going to write Long.

-------------

Commit messages:
 - update min size to Long.BYTES

Changes: https://git.openjdk.org/jdk/pull/27027/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27027&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366495
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/27027.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27027/head:pull/27027

PR: https://git.openjdk.org/jdk/pull/27027