Add MALLOC_LOW_MEMORY as synonym for MALLOC_SVELTE.

The MALLOC_SVELTE variable name is confusing, so add a new variable
name called MALLOC_LOW_MEMORY. Still support MALLOC_SVELTE.
Also, support the change of Malloc_not_svelte to Malloc_low_memory.

Test: Verified scudo config is used by default.
Test: Verfified Android GO config uses the jemalloc low memory config.
Change-Id: I2606205da746d8ab20e29884c7dcb5a77add51e4

core/board_config.mk

@@ -274,7 +274,7 @@ endif
 
 ifneq ($(MALLOC_IMPL),)
   $(warning *** Unsupported option MALLOC_IMPL defined by board config: $(board_config_mk).)
-  $(error Use `MALLOC_SVELTE := true` to configure jemalloc for low-memory)
+  $(error Use `MALLOC_LOW_MEMORY := true` to use low-memory allocator config)
 endif
 board_config_mk :=
 

core/soong_config.mk

@@ -154,7 +154,7 @@ $(call add_json_list, ExtraVndkVersions,                 $(PRODUCT_EXTRA_VNDK_VE
 $(call add_json_list, DeviceSystemSdkVersions,           $(BOARD_SYSTEMSDK_VERSIONS))
 $(call add_json_str,  RecoverySnapshotVersion,           $(RECOVERY_SNAPSHOT_VERSION))
 $(call add_json_list, Platform_systemsdk_versions,       $(PLATFORM_SYSTEMSDK_VERSIONS))
-$(call add_json_bool, Malloc_not_svelte,                 $(call invert_bool,$(filter true,$(MALLOC_SVELTE))))
+$(call add_json_bool, Malloc_low_memory,                 $(findstring true,$(MALLOC_SVELTE) $(MALLOC_LOW_MEMORY)))
 $(call add_json_bool, Malloc_zero_contents,              $(call invert_bool,$(filter false,$(MALLOC_ZERO_CONTENTS))))
 $(call add_json_bool, Malloc_pattern_fill_contents,      $(MALLOC_PATTERN_FILL_CONTENTS))
 $(call add_json_str,  Override_rs_driver,                $(OVERRIDE_RS_DRIVER))

target/board/ndk/BoardConfig.mk

@@ -15,6 +15,6 @@
 
 TARGET_ARCH_SUITE := ndk
 
-MALLOC_SVELTE := true
+MALLOC_LOW_MEMORY := true
 
 USE_SAFESTACK := false