x86: Properly handle USE_VECTOR_FP_CONVERTS/USE_VECTOR_CONVERTS

x86: Properly handle USE_VECTOR_FP_CONVERTS/USE_VECTOR_CONVERTS

Check TARGET_USE_VECTOR_FP_CONVERTS or TARGET_USE_VECTOR_CONVERTS when
handling avx_partial_xmm_update attribute.  Don't convert AVX partial
XMM register update if vector packed SSE conversion should be used.

gcc/

	PR target/101900
	* config/i386/i386-features.c (remove_partial_avx_dependency):
	Check TARGET_USE_VECTOR_FP_CONVERTS and TARGET_USE_VECTOR_CONVERTS
	before generating vxorps.

gcc/testsuite

	PR target/101900
	* gcc.target/i386/pr101900-1.c: New test.
	* gcc.target/i386/pr101900-2.c: Likewise.
	* gcc.target/i386/pr101900-3.c: Likewise.