[AArch64] allow 16 bytes constants in constant pool.

[Marcus Shawcroft]

Relax the logic that prevents TFmode constants being addressed in the 
constant pool.

2012-09-06  Marcus Shawcroft  <marcus.shawcroft@arm.com>

         * config/aarch64/aarch64.c (aarch64_classify_address):
         Allow 16 byte modes in constant pool.

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