[PATCH][AARCH64] Support tail indirect function call

[Jiong Wang]

Current, indirect function call prevents tail-call optimization on AArch64.

This patch adapt the fix for PR arm/19599 to AArch64.

Is it ok for next stage 1?

Thanks.

-- Jiong

gcc/

     * config/aarch64/predicates.md (aarch64_call_insn_operand): New 
predicate.
     * config/aarch64/constraints.md ("Ucs", "Usf"):  New constraints.
     * config/aarch64/aarch64.md (*sibcall_insn, *sibcall_value_insn): 
Adjust for
     tailcalling through registers.
     * config/aarch64/aarch64.h (enum reg_class): New caller save 
register class.
     (REG_CLASS_NAMES): Likewise.
     (REG_CLASS_CONTENTS): Likewise.
     * config/aarch64/aarch64.c (aarch64_function_ok_for_sibcall): Allow 
tailcalling
     without decls.

gcc/testsuite

     *gcc.target/aarch64/tail-indirect-call.c: New test.

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