rs6000: Use parameterized names for tablejump

rs6000: Use parameterized names for tablejump

We have too many tablejump patterns.  Using parameterized names
simplifies the code a bit.

2020-09-29  Segher Boessenkool  <segher@kernel.crashing.org>

	* config/rs6000/rs6000.md (tablejump): Simplify.
	(tablejumpsi): Merge this ...
	(tablejumpdi): ... and this ...
	(@tablejump<mode>_normal): ... into this.
	(tablejumpsi_nospec): Merge this ...
	(tablejumpdi_nospec): ... and this ...
	(@tablejump<mode>_nospec): ... into this.
	(*tablejump<mode>_internal1): Delete, rename to ...
	(@tablejump<mode>_insn_normal): ... this.
	(*tablejump<mode>_internal1_nospec): Delete, rename to ...
	(@tablejump<mode>_insn_nospec): ... this.