[SPARK-15285][SQL] Generated SpecificSafeProjection.apply method grows beyond 64 KB

## What changes were proposed in this pull request?

This PR splits the generated code for ```SafeProjection.apply``` by using ```ctx.splitExpressions()```. This is because the large code body for ```NewInstance``` may grow beyond 64KB bytecode size for ```apply()``` method.

## How was this patch tested?

Added new tests

Author: Kazuaki Ishizaki <ishizaki@jp.ibm.com>

Closes #13243 from kiszk/SPARK-15285.