Generate debug info for core.oat files.

The debug info is needed for CFI unwinding tests.

I am adding this as part of investigating build bot failure,
I suspect the it might not be generating the debug info by default.

Change-Id: Ic0cdda345355161d44949308d6d70ff59542cc1e
diff --git a/build/Android.oat.mk b/build/Android.oat.mk
index 710b130..728469c 100644
--- a/build/Android.oat.mk
+++ b/build/Android.oat.mk
@@ -113,7 +113,7 @@
 	  --oat-location=$$(PRIVATE_CORE_OAT_NAME) --image=$$(PRIVATE_CORE_IMG_NAME) \
 	  --base=$$(LIBART_IMG_HOST_BASE_ADDRESS) --instruction-set=$$($(3)ART_HOST_ARCH) \
 	  --instruction-set-features=$$($(3)DEX2OAT_HOST_INSTRUCTION_SET_FEATURES) \
-	  --host --android-root=$$(HOST_OUT) --include-patch-information \
+	  --host --android-root=$$(HOST_OUT) --include-patch-information --generate-debug-info \
 	  $$(PRIVATE_CORE_COMPILE_OPTIONS)
 
 $$(core_oat_name): $$(core_image_name)
@@ -232,7 +232,7 @@
 	  --base=$$(LIBART_IMG_TARGET_BASE_ADDRESS) --instruction-set=$$($(3)TARGET_ARCH) \
 	  --instruction-set-variant=$$($(3)DEX2OAT_TARGET_CPU_VARIANT) \
 	  --instruction-set-features=$$($(3)DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES) \
-	  --android-root=$$(PRODUCT_OUT)/system --include-patch-information \
+	  --android-root=$$(PRODUCT_OUT)/system --include-patch-information --generate-debug-info \
 	  $$(PRIVATE_CORE_COMPILE_OPTIONS) || (rm $$(PRIVATE_CORE_OAT_NAME); exit 1)
 
 $$(core_oat_name): $$(core_image_name)