Add HOST_PREFER_32_BIT to Soong Config and move art-tools to product configuration.

This change accomplishes two things:

Adds `HOST_PREFER_32_BIT` to Soong config variables:
The `HOST_PREFER_32_BIT` environment variable is frequently used in
Android.mk files within the art/ directory. By adding it to
soong_config_variable, we make it accessible to the Soong build system,
which will be essential when converting art modules to Android.bp.

Moves `art-tools` to product configuration:
Originally, `art-tools` was a phony target added to
PRODUCT_HOST_PACKAGES. This approach is incorrect because
PRODUCT_HOST_PACKAGES should only contain actual modules, not phony
targets. We are addressing this by converting the dependencies and
conditional statements (ifeq) within `art-tools` into
PRODUCT_HOST_PACKAGES entries in base_system.mk.

Bug: 346702835
Test: m -j; Then, check related dependencies build in the system.
Change-Id: Iab252dea71c9df9d75f2701b33d3cd4d391e7f5d

core/android_soong_config_vars.mk

@@ -44,6 +44,8 @@ $(call soong_config_set_bool,ANDROID,SANITIZE_TARGET_SYSTEM_ENABLED,$(if $(filte
 # PRODUCT_PRECOMPILED_SEPOLICY defaults to true. Explicitly check if it's "false" or not.
 $(call soong_config_set_bool,ANDROID,PRODUCT_PRECOMPILED_SEPOLICY,$(if $(filter false,$(PRODUCT_PRECOMPILED_SEPOLICY)),false,true))
 
+# For art modules
+$(call soong_config_set_bool,art_module,host_prefer_32_bit,$(if $(filter true,$(HOST_PREFER_32_BIT)),true,false))
 ifdef ART_DEBUG_OPT_FLAG
 $(call soong_config_set,art_module,art_debug_opt_flag,$(ART_DEBUG_OPT_FLAG))
 endif

target/product/base_system.mk

@@ -403,7 +403,6 @@ PRODUCT_HOST_PACKAGES += \
     BugReport \
     adb \
     adevice \
-    art-tools \
     atest \
     bcc \
     bit \
@@ -434,6 +433,21 @@ PRODUCT_HOST_PACKAGES += \
     tz_version_host \
     tz_version_host_tzdata_apex \
 
+# For art-tools, if the dependencies have changed, please sync them to art/Android.bp as well.
+PRODUCT_HOST_PACKAGES += \
+    ahat \
+    dexdump \
+    hprof-conv
+# A subset of the tools are disabled when HOST_PREFER_32_BIT is defined as make reports that
+# they are not supported on host (b/129323791). This is likely due to art_apex disabling host
+# APEX builds when HOST_PREFER_32_BIT is set (b/120617876).
+ifneq ($(HOST_PREFER_32_BIT),true)
+PRODUCT_HOST_PACKAGES += \
+    dexlist \
+    oatdump
+endif
+
+
 PRODUCT_PACKAGES += init.usb.rc init.usb.configfs.rc
 
 PRODUCT_PACKAGES += etc_hosts