RenderScript pending kernel breakpoints.

Currently the RS breakpoint command can only find a kernel if it's in an already loaded RS module.
This patch allows users to set pending breakpoints on RenderScript kernels which will be loaded in the future.
Implemented by creating a RS breakpoint resolver, to limit search scope to only RS modules.

Reviewed by: clayborg, jingham
Subscribers: lldb-commits, ADodds, domipheus
Differential Revision: http://reviews.llvm.org/D12360

llvm-svn: 246842