RFR: 8349214: Improve size optimization flags for MSVC builds

[Matthias Baesken]

On Tue, 4 Feb 2025 13:30:46 GMT, Julian Waters <jwaters at openjdk.org> wrote:

> splashscreen already uses LOW for its optimization flags though. Is the intent to change it to SIZE for all compilers?

LOW uses NORM and this is already O1  
`C_O_FLAG_NORM="-O1"`

so for Windows switching to SIZE won't change anything after this PR.  So yes it will probably SIZE for splashscreen  for all compilers.

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PR Comment: https://git.openjdk.org/jdk/pull/23432#issuecomment-2634109704