Revert "Revert "Set global default to use lld.""

This reverts commit 44988be862cd7954d6344d004bdc6139a4bd4f77.

Three known build failures with lld are fixed by
(1) adding --no-fatal-warnings to link
(2) disable LLD for some PGO build targets
(3) disable LLD for some art oatdump tests, pending c/681542

Change-Id: Icebf6661509bf4f6051f91dc74eaa07dbc7c1d42
diff --git a/core/soong_config.mk b/core/soong_config.mk
index 4d502ec..54ad783 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -101,7 +101,7 @@
 $(call add_json_list, CFIIncludePaths,                   $(CFI_INCLUDE_PATHS) $(PRODUCT_CFI_INCLUDE_PATHS))
 $(call add_json_list, IntegerOverflowExcludePaths,       $(INTEGER_OVERFLOW_EXCLUDE_PATHS) $(PRODUCT_INTEGER_OVERFLOW_EXCLUDE_PATHS))
 
-$(call add_json_bool, UseClangLld,                       $(filter 1 true,$(USE_CLANG_LLD)))
+$(call add_json_bool, UseClangLld,                       $(call invert_bool,$(filter 0 false,$(USE_CLANG_LLD))))
 $(call add_json_bool, ClangTidy,                         $(filter 1 true,$(WITH_TIDY)))
 $(call add_json_str,  TidyChecks,                        $(WITH_TIDY_CHECKS))