Fix image_test for the CC collector.

Increase the image address space reserve.

Bug: 27578460
Change-Id: I262f6be81c496a7a777013702e3da74ea4d619b4
diff --git a/compiler/common_compiler_test.cc b/compiler/common_compiler_test.cc
index 0001b67..f75a252 100644
--- a/compiler/common_compiler_test.cc
+++ b/compiler/common_compiler_test.cc
@@ -285,7 +285,7 @@
   MemMap::Init();
   image_reservation_.reset(MemMap::MapAnonymous("image reservation",
                                                 reinterpret_cast<uint8_t*>(ART_BASE_ADDRESS),
-                                                (size_t)100 * 1024 * 1024,  // 100MB
+                                                (size_t)120 * 1024 * 1024,  // 120MB
                                                 PROT_NONE,
                                                 false /* no need for 4gb flag with fixed mmap*/,
                                                 false /* not reusing existing reservation */,