[PATCH] Translate dollar signs to underscores for AIX (PR target/35483)

["David Edelsohn" <dje dot gcc at gmail dot com>]

The AIX XCOFF assembler does not allow dollar signs in symbols --
dollar signs have a special
meaning as the current location.  Java requires dollar signs in symbols.

This patch is a revised and rewritten version of the original patch in
the Bugzilla PR.  It defines
ASM_OUTPUT_LABELREF, used by varasm.c:assemble_name(), to translate dollar signs
to underscores.  ASM_DECLARE_FUNCTION_NAME and ASM_OUTPUT_EXTERNAL also
perform the same translation and use the rename pseudo-op to export
the original name
with dollar sign.

Bootstrapped and regression tested on powerpc-ibm-aix5.3.0.0.

Any comments / suggestions about the implementation?

Thanks, David

        PR target/35483
        * xcoffout.h (DBX_FINISH_STABS): Translate dollar sign to underscore.
        * config/rs6000/rs6000-protos.h (rs6000_xcoff_strip_dollar): Declare.
        * config/rs6000/xcoff.h (ASM_DECLARE_FUNCTION_NAME): Translate
        dollar sign to underscore.
        (ASM_OUTPUT_EXTERNAL): Same.
        (ASM_OUTPUT_LABELREF): New.
        * config/rs6000/rs6000.c (rs6000_xcoff_strip_dollar): New.

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