Support G_MERGE_VALUES, G_UNMERGE_VALUES, G_INSERT, G_EXTRACT selection for vector types. Implement G_MERGE_VALUES/G_UNMERGE_VALUES selection by spliting nodes to G_INSERT/G_EXTRACT sequense.

Support vector type G_UNMERGE_VALUES selection. For now G_UNMERGE_VALUES marked as legal for any type, so nothing to do in legalizer.

Support G_MERGE_VALUES,vector type G_UNMERGE_VALUES, G_INSERT, G_EXTRACTS selection for. vectorFor now G_UNMERGE_VALUES marked as legal for any types., Implement G_MERGE_VALUES/G_UNMERGE_VALUES selection by splitso nothing nodes to G_INSERT/G_EXTRACT sequenseto do in legalizer.