Report device out-of-memory conditions

Print the out-of-memory error GPUCompiler's `gc_pool_alloc` reports when
`malloc` returns null, as CUDA.jl does, instead of letting the work-item exit
silently after exhausting its heap.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Fy9hCZkRFuf9fbRQNagCxf

Author: maleadt

src/device/runtime.jl

@@ -65,6 +65,7 @@ function malloc(sz::Csize_t)
 end
 
 function report_oom(sz)
+    @println("ERROR: Out of dynamic GPU memory (trying to allocate ", sz, " bytes)")
     return
 end