[mono] Fix r8->i conversion on amd64/arm64. (#64467)

Fixes #64386.

Author: vargaz

src/mono/mono/mini/mini-amd64.c

@@ -6011,9 +6011,9 @@ mono_arch_output_basic_block (MonoCompile *cfg, MonoBasicBlock *bb)
 			code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 4, FALSE);
 			break;
 		case OP_FCONV_TO_I4:
-		case OP_FCONV_TO_I:
 			code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 4, TRUE);
 			break;
+		case OP_FCONV_TO_I:
 		case OP_FCONV_TO_I8:
 			code = emit_float_to_int (cfg, code, ins->dreg, ins->sreg1, 8, TRUE);
 			break;

src/mono/mono/mini/mini-arm64.c

@@ -4226,14 +4226,14 @@ mono_arch_output_basic_block (MonoCompile *cfg, MonoBasicBlock *bb)
 			arm_uxthw (code, dreg, dreg);
 			break;
 		case OP_FCONV_TO_I4:
-		case OP_FCONV_TO_I:
 			arm_fcvtzs_dx (code, dreg, sreg1);
 			arm_sxtwx (code, dreg, dreg);
 			break;
 		case OP_FCONV_TO_U4:
 			arm_fcvtzu_dx (code, dreg, sreg1);
 			break;
 		case OP_FCONV_TO_I8:
+		case OP_FCONV_TO_I:
 			arm_fcvtzs_dx (code, dreg, sreg1);
 			break;
 		case OP_FCONV_TO_U8: