benchmarks: Add a microbenchmark for relocation overhead

Allow specification of the many different busyness modes and relocation
interfaces, along with the number of buffers to use and relocations.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/benchmarks/Makefile.sources b/benchmarks/Makefile.sources
index 3dc0263..a456e05 100644
--- a/benchmarks/Makefile.sources
+++ b/benchmarks/Makefile.sources
@@ -8,6 +8,7 @@
 	gem_create			\
 	gem_exec_ctx			\
 	gem_exec_nop			\
+	gem_exec_reloc			\
 	gem_exec_trace			\
 	gem_mmap			\
 	gem_prw				\