Integrated: 8345659: Fix broken alignment after ReservedSpace splitting in GC code

[Stefan Karlsson]

On Fri, 6 Dec 2024 10:16:33 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> The Serial and Parallel GCs create a ReservedSpace for the total heap and then splits it into a young generation ReservedSpace and an old generation ReservedSpace. The latter operation creates an ReservedSpace with an alignment that doesn't match the base address. This bug is benign because the ReservedSpaces are short-lived and we don't look at the alignment. However, if we are to add stricter checks when creating ReservedSpaces we need to fix this. 
> 
> Tested with tier1-3

This pull request has now been integrated.

Changeset: c34b87c5
Author:    Stefan Karlsson <stefank at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/c34b87c52bbaf37d01cb2a73846631a037b312a5
Stats:     4 lines in 2 files changed: 0 ins; 0 del; 4 mod

8345659: Fix broken alignment after ReservedSpace splitting in GC code

Reviewed-by: ayang, aboldtch

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PR: https://git.openjdk.org/jdk/pull/22602