ART: Wire up a valgrind-wrapped dex2oat run

Extend build-art-executable to understand multilib=both, in which
case a stem is necessary. Use name32 for the 32b version, and name
for the 64b version (or only version).

Create both 32b and 64b dex2oat on the host.

Extend the core generation rules to allow a wrapper. Create rules
to run with valgrind: valgrind-test-art-host-dex2oat.

Currently this is not wired up to valgrind-test-art-host, as valgrind
reports an error on exit.

Note: this takes a long time, as by default the debug version of
dex2oat is used. The author has seen runs of about 6 minutes.

Bug: 18605772
Change-Id: I32c270d2cf8a104f154bdf91875670b03d3f5d3b
diff --git a/dex2oat/Android.mk b/dex2oat/Android.mk
index 4f39c42..cf30667 100644
--- a/dex2oat/Android.mk
+++ b/dex2oat/Android.mk
@@ -38,8 +38,8 @@
 
 # We always build dex2oat and dependencies, even if the host build is otherwise disabled, since they are used to cross compile for the target.
 ifeq ($(ART_BUILD_HOST_NDEBUG),true)
-  $(eval $(call build-art-executable,dex2oat,$(DEX2OAT_SRC_FILES),libart-compiler libziparchive-host,art/compiler,host,ndebug))
+  $(eval $(call build-art-executable,dex2oat,$(DEX2OAT_SRC_FILES),libart-compiler libziparchive-host,art/compiler,host,ndebug,both))
 endif
 ifeq ($(ART_BUILD_HOST_DEBUG),true)
-  $(eval $(call build-art-executable,dex2oat,$(DEX2OAT_SRC_FILES),libartd-compiler libziparchive-host,art/compiler,host,debug))
+  $(eval $(call build-art-executable,dex2oat,$(DEX2OAT_SRC_FILES),libartd-compiler libziparchive-host,art/compiler,host,debug,both))
 endif