RFR: 8317132: Prepare HotSpot for permissive- [v11]

[Julian Waters]

On Wed, 1 Nov 2023 11:19:20 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 two additional commits since the last revision:
> 
>  - Formatting os_windows.cpp
>  - Duplicate return statement instead in os_windows.cpp

With this, the reign of non-conforming HotSpot code on Windows comes to an end :)

Will wait for the tests to pass before integrating

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PR Comment: https://git.openjdk.org/jdk/pull/15955#issuecomment-1788791820