8258484: AIX build fails in Harfbuzz with XLC 16.01.0000.0006

Backport-of: 3f9f86f

make/modules/java.desktop/lib/Awt2dLibraries.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2020, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2021, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -474,6 +474,11 @@ else
     #
 
   LIBHARFBUZZ_OPTIMIZATION := HIGH
+  # Early re-canonizing has to be disabled to workaround an internal XlC compiler error
+  # when building libharfbuzz
+  ifeq ($(call isTargetOs, aix), true)
+    LIBHARFBUZZ_CFLAGS += -qdebug=necan
+  endif
 
   LIBHARFBUZZ_CFLAGS += $(X_CFLAGS) -DLE_STANDALONE -DHEADLESS