Reapply "Remove unassigned event log tags feature"

.logtags files are a mapping of an integer -> name. However, there
is an unused feature where you could put a '?' instead of an integer,
and then the build system would assign a number to it, taking care
to avoid all other already-assigned numbers across the source tree.

This feature makes it hard to support some things we're working towards,
like incremental soong and treble common system images, so remove it.

Also modernize the python scripts a little.

The additions since the revert are the cleanups from aosp/3403019, and
removing a missed reference to all-event-log-tags.txt in java.mk.

This reverts commit 07a79235798c369752b3f003be7326e219f992b8.

Bug: 382515940
Test: m event-log-tags on an internal product
Change-Id: I8f8674e65482816e56d44c5e8ae81d2230575cc6
diff --git a/core/Makefile b/core/Makefile
index 9728b52..e106dad 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -970,27 +970,12 @@
 
 # -----------------------------------------------------------------
 
-.PHONY: event-log-tags
-
-# Produce an event logs tag file for everything we know about, in order
-# to properly allocate numbers.  Then produce a file that's filtered
-# for what's going to be installed.
-
-all_event_log_tags_file := $(TARGET_OUT_COMMON_INTERMEDIATES)/all-event-log-tags.txt
-
 event_log_tags_file := $(TARGET_OUT)/etc/event-log-tags
 
 # Include tags from all packages that we know about
 all_event_log_tags_src := \
     $(sort $(foreach m, $(ALL_MODULES), $(ALL_MODULES.$(m).EVENT_LOG_TAGS)))
 
-$(all_event_log_tags_file): PRIVATE_SRC_FILES := $(all_event_log_tags_src)
-$(all_event_log_tags_file): $(all_event_log_tags_src) $(MERGETAGS) build/make/tools/event_log_tags.py
-	$(hide) mkdir -p $(dir $@)
-	$(hide) $(MERGETAGS) -o $@ $(PRIVATE_SRC_FILES)
-
-$(call declare-0p-target,$(all_event_log_tags_file))
-
 # Include tags from all packages included in this product, plus all
 # tags that are part of the system (ie, not in a vendor/ or device/
 # directory).
@@ -1002,13 +987,13 @@
       $(filter-out vendor/% device/% out/%,$(all_event_log_tags_src)))
 
 $(event_log_tags_file): PRIVATE_SRC_FILES := $(event_log_tags_src)
-$(event_log_tags_file): PRIVATE_MERGED_FILE := $(all_event_log_tags_file)
-$(event_log_tags_file): $(event_log_tags_src) $(all_event_log_tags_file) $(MERGETAGS) build/make/tools/event_log_tags.py
+$(event_log_tags_file): $(event_log_tags_src) $(MERGETAGS)
 	$(hide) mkdir -p $(dir $@)
-	$(hide) $(MERGETAGS) -o $@ -m $(PRIVATE_MERGED_FILE) $(PRIVATE_SRC_FILES)
+	$(hide) $(MERGETAGS) -o $@ $(PRIVATE_SRC_FILES)
 
 $(eval $(call declare-0p-target,$(event_log_tags_file)))
 
+.PHONY: event-log-tags
 event-log-tags: $(event_log_tags_file)
 
 ALL_DEFAULT_INSTALLED_MODULES += $(event_log_tags_file)
diff --git a/core/config.mk b/core/config.mk
index d62b86d..20ebeeb 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -730,8 +730,8 @@
 PROGUARD_HOME := external/proguard
 PROGUARD := $(PROGUARD_HOME)/bin/proguard.sh
 PROGUARD_DEPS := $(PROGUARD) $(PROGUARD_HOME)/lib/proguard.jar
-JAVATAGS := build/make/tools/java-event-log-tags.py
-MERGETAGS := build/make/tools/merge-event-log-tags.py
+JAVATAGS := $(HOST_OUT_EXECUTABLES)/java-event-log-tags
+MERGETAGS := $(HOST_OUT_EXECUTABLES)/merge-event-log-tags
 APPEND2SIMG := $(HOST_OUT_EXECUTABLES)/append2simg
 VERITY_SIGNER := $(HOST_OUT_EXECUTABLES)/verity_signer
 BUILD_VERITY_METADATA := $(HOST_OUT_EXECUTABLES)/build_verity_metadata
diff --git a/core/definitions.mk b/core/definitions.mk
index adb35e0..1ab6388 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -1555,7 +1555,7 @@
 define transform-logtags-to-java
 @mkdir -p $(dir $@)
 @echo "logtags: $@ <= $<"
-$(hide) $(JAVATAGS) -o $@ $< $(PRIVATE_MERGED_TAG)
+$(hide) $(JAVATAGS) -o $@ $<
 endef
 
 
diff --git a/core/java.mk b/core/java.mk
index 5fbc916..41a1b1b 100644
--- a/core/java.mk
+++ b/core/java.mk
@@ -140,8 +140,7 @@
 logtags_java_sources := $(patsubst %.logtags,%.java,$(addprefix $(intermediates.COMMON)/logtags/, $(logtags_sources)))
 logtags_sources := $(addprefix $(LOCAL_PATH)/, $(logtags_sources))
 
-$(logtags_java_sources): PRIVATE_MERGED_TAG := $(TARGET_OUT_COMMON_INTERMEDIATES)/all-event-log-tags.txt
-$(logtags_java_sources): $(intermediates.COMMON)/logtags/%.java: $(LOCAL_PATH)/%.logtags $(TARGET_OUT_COMMON_INTERMEDIATES)/all-event-log-tags.txt $(JAVATAGS) build/make/tools/event_log_tags.py
+$(logtags_java_sources): $(intermediates.COMMON)/logtags/%.java: $(LOCAL_PATH)/%.logtags $(JAVATAGS)
 	$(transform-logtags-to-java)
 
 else