RFR: 8317132: Prepare HotSpot for permissive- [v6]

[Jorn Vernee]

On Wed, 4 Oct 2023 04:46:29 GMT, Julian Waters <jwaters at openjdk.org> wrote:

>> Prepare HotSpot for the permissive- Visual C++ flag, this change contains all of the fixes required for HotSpot to compile under the stricter mode activated when the permissive- flag is passed
>> 
>> - Reworks code in topLevelUnhandledExceptionFilter for os_windows.cpp to avoid goto jumping across uninitialized locals
>> - Adds a CAST_FROM_FN_PTR cast to the return value from ::signal to void, as they cannot be implicitly converted
>> - symbolengine.cpp's SimpleBufferWithFallback's templates cannot work with a raw char (Actual fix under discussion)
>> - Removed a throw() specification from a mismatched definition in allocation.cpp
>
> Julian Waters has updated the pull request incrementally with three additional commits since the last revision:
> 
>  - Initialized thread in os_windows.cpp
>  - Oops in os_windows.cpp
>  - Remove goto in os_windows.cpp

os_windows.cpp changes look good

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Marked as reviewed by jvernee (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/15955#pullrequestreview-1660830265