arm: [MVE intrinsics] factorize vcvtbq vcvttq

arm: [MVE intrinsics] factorize vcvtbq vcvttq

Factorize vcvtbq, vcvttq so that they use the same parameterized
names.

2024-07-11  Christophe Lyon  <christophe.lyon@linaro.org>

	gcc/
	* config/arm/iterators.md (mve_insn): Add VCVTBQ_F16_F32,
	VCVTTQ_F16_F32, VCVTBQ_F32_F16, VCVTTQ_F32_F16, VCVTBQ_M_F16_F32,
	VCVTTQ_M_F16_F32, VCVTBQ_M_F32_F16, VCVTTQ_M_F32_F16.
	(VCVTxQ_F16_F32): New iterator.
	(VCVTxQ_F32_F16): Likewise.
	(VCVTxQ_M_F16_F32): Likewise.
	(VCVTxQ_M_F32_F16): Likewise.
	* config/arm/mve.md (mve_vcvttq_f32_f16v4sf)
	(mve_vcvtbq_f32_f16v4sf): Merge into ...
	(@mve_<mve_insn>q_f32_f16v4sf): ... this.
	(mve_vcvtbq_f16_f32v8hf, mve_vcvttq_f16_f32v8hf): Merge into ...
	(@mve_<mve_insn>q_f16_f32v8hf): ... this.
	(mve_vcvtbq_m_f16_f32v8hf, mve_vcvttq_m_f16_f32v8hf): Merge into
	...
	(@mve_<mve_insn>q_m_f16_f32v8hf): ... this.
	(mve_vcvtbq_m_f32_f16v4sf, mve_vcvttq_m_f32_f16v4sf): Merge into
	...
	(@mve_<mve_insn>q_m_f32_f16v4sf): ... this.