[PATCH] Add --disable-tm-clone-registry libgcc configure option.

[ilia.diachkov@optimitech.com]

Hello,

This patch adds libgcc configuration option to disable TM clone 
registry. This option helps to reduce code size for embedded targets 
which do not need transactional memory support.

Tested on x86_64 and riscv64-unknown-elf-gcc, the last is with the 
option enabled.

If the change is Ok with you, please commit it since I have no write 
access to gcc repository.

Best regards,
Ilia.

libgcc/ChangeLog:

         * Makefile.in: Add @use_tm_clone_registry@.
         * configure: Regenerate.
         * configure.ac: Add --disable-tm-clone-registry option.

gcc/ChangeLog:

         * doc/install.texi: Document --disable-tm-clone-registry.

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