Implement expandKernel() for pass-by-value.

This change implements the libbcc portion of pass-by-value in RS kernels.
The expandKernel() function creates the appropriate loop construct around
the kernel call (thus foo() -> foo.expand()).

Bug: 7166741

Change-Id: I2e4c85b8ac70372dc6d02671e8768381070e9721
1 file changed