[RenderScript] Fix reduction argument printing

When placing function name breakpoints on RenderScript Reduction kernel
functions, we were not skipping over the function prologue meaning that
inspection of the arguments could be garbled as the function was not finished
setting up the stack/registers.

In
[122fe8f](https://github.com/llvm-mirror/lldb/commit/122fe8f47255ec850155495d10526fccc51f95fb)
Aidan added the `SkipPrologue` function that allows us to trivially fix up the
kernel's functions' resolved addresses, falling gracefully back to the old
behaviour if we don't know how to handle the prologue or can't resolve its
size.

llvm-svn: 286387