Don't ignore output selection in assembly mode

test/cmdlineTests/strict_asm_output_selection_ir_optimized_only/args

@@ -0,0 +1 @@
+--strict-assembly --optimize --ir-optimized

test/cmdlineTests/strict_asm_output_selection_ir_optimized_only/err

@@ -0,0 +1 @@
+Warning: Yul is still experimental. Please use the output with care.

test/cmdlineTests/strict_asm_output_selection_ir_optimized_only/input.yul

@@ -0,0 +1,4 @@
+{
+    let x := 42
+    sstore(0, x)
+}

test/cmdlineTests/strict_asm_output_selection_ir_optimized_only/output

@@ -0,0 +1,7 @@
+
+======= strict_asm_output_selection_ir_optimized_only/input.yul (EVM) =======
+
+Pretty printed source:
+object "object" {
+    code { { sstore(0, 42) } }
+}