Currently the default C calling convention functions are treated
the same as compute kernels. Make this explicit so the default
calling convention can be changed to a non-kernel.
Converted with perl -pi -e 's/define void/define amdgpu_kernel void/'
on the relevant test directories (and undoing in one place that actually
wanted a non-kernel).
llvm-svn: 298444
The only real reason to use it is for testing, so replace
it with a command line option instead of a potentially function
dependent feature.
llvm-svn: 273653
Matt Arsenault