Disable .toc optimization for host modules.

Host binaries may be run during the build process and the internal
implementation of the shared libraries makes a difference for the build
result. This change makes sure host tools get re-linked and re-run when
any of its dependency libraries gets updated.
DEX2OAT is such a host tool. We also changed DEX2OAT as full dependency
of dex-preoptimization, so we rebuild the odex files if DEX2OAT itself,
or any dependency libraries changed.

Bug: 24597504
Change-Id: Idf0d9be82ccebd826d9c5b405a39cff437e0af29
diff --git a/core/base_rules.mk b/core/base_rules.mk
index 5ee5edf..7e33660 100644
--- a/core/base_rules.mk
+++ b/core/base_rules.mk
@@ -227,6 +227,9 @@
 # dependent binaries of a .toc file will be rebuilt only when the content of
 # the .toc file is changed.
 ###########################################################
+ifndef LOCAL_IS_HOST_MODULE
+# Disable .toc optimization for host modules: we may run the host binaries during the build process
+# and the libraries' implementation matters.
 ifeq ($(LOCAL_MODULE_CLASS),SHARED_LIBRARIES)
 LOCAL_INTERMEDIATE_TARGETS += $(LOCAL_BUILT_MODULE).toc
 $(LOCAL_BUILT_MODULE).toc: $(LOCAL_BUILT_MODULE)
@@ -236,6 +239,7 @@
 # Kati adds restat=1 to ninja. GNU make does nothing for this.
 .KATI_RESTAT: $(LOCAL_BUILT_MODULE).toc
 endif
+endif
 
 ###########################################################
 ## logtags: Add .logtags files to global list