8247909: Improve PrimitiveConversions::cast using C++14 Reimpliment PrimitiveConversions::cast, with some cases now constexpr. <!-- Anything below this marker will be automatically updated, please do not edit manually! --> --------- ### Progress - [x] Change must not contain extraneous whitespace - [x] Commit message must refer to an issue - [ ] Change must be properly reviewed ### Issue * [JDK-8247909](https://bugs.openjdk.java.net/browse/JDK-8247909): Improve PrimitiveConversions::cast using C++14 ### Download `$ git fetch https://git.openjdk.java.net/jdk pull/143/head:pull/143` `$ git checkout pull/143` Reviewed-by: dholmes, stefank
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