6891677: java/build integrate zero assembler JDK changes

Summary: Build changes for the Zero assembler port
Reviewed-by: ohair, tbell

make/hotspot-rules.gmk

@@ -72,6 +72,10 @@ ifeq ($(DEBUG_NAME), fastdebug)
   HOTSPOT_TARGET = all_fastdebug
 endif
 
+ifeq ($(ZERO_BUILD), true)
+  HOTSPOT_TARGET := $(HOTSPOT_TARGET)zero
+endif
+
 HOTSPOT_BUILD_ARGUMENTS += $(COMMON_BUILD_ARGUMENTS)
 HOTSPOT_BUILD_ARGUMENTS += ALT_OUTPUTDIR=$(HOTSPOT_OUTPUTDIR)
 HOTSPOT_BUILD_ARGUMENTS += ALT_EXPORT_PATH=$(HOTSPOT_EXPORT_PATH)