tcg/ppc: Change TCG_REG_RA to TCG_REG_TB
At this point the conversion is a wash. Loading of TB+ofs is
smaller, but the actual return address from exit_tb is larger.
There are a few more insns required to transition between TBs.
But the expectation is that accesses to the constant pool will
on the whole be smaller.
Signed-off-by: NRichard Henderson <rth@twiddle.net>
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