Test MIR inlined var debug info

tests/mir-opt/inline_var_debug_info_kept.rs

@@ -0,0 +1,50 @@
+//@ test-mir-pass: Inline
+//@ revisions: PRESERVE FULL NONE LIMITED
+//@ [PRESERVE]compile-flags: -O -C debuginfo=0 -Zinline-mir-preserve-debug
+//@ [FULL]compile-flags: -O -C debuginfo=2
+//@ [NONE]compile-flags: -O -C debuginfo=0
+//@ [LIMITED]compile-flags: -O -C debuginfo=1
+
+#[inline(always)]
+fn inline_fn1(arg1: i32) -> i32 {
+    let local1 = arg1 + 1;
+    let _local2 = 10;
+    arg1 + local1
+}
+
+#[inline(always)]
+fn inline_fn2(binding: i32) -> i32 {
+    {
+        let binding = inline_fn1(binding);
+        binding
+    }
+}
+
+#[inline(never)]
+fn test() -> i32 {
+    // CHECK-LABEL: fn test
+    inline_fn2(1)
+    // CHECK-LABEL: (inlined inline_fn2)
+
+    // PRESERVE: debug binding =>
+    // FULL: debug binding =>
+    // NONE-NOT: debug binding =>
+    // LIMITED-NOT: debug binding =>
+
+    // CHECK-LABEL: (inlined inline_fn1)
+
+    // PRESERVE: debug arg1 =>
+    // FULL: debug arg1 =>
+    // NONE-NOT: debug arg1 =>
+    // LIMITED-NOT: debug arg1 =>
+
+    // PRESERVE: debug local1 =>
+    // FULL: debug local1 =>
+    // NONE-NOT: debug local1 =>
+    // LIMITED-NOT: debug local1 =>
+
+    // PRESERVE: debug _local2 =>
+    // FULL: debug _local2 =>
+    // NONE-NOT: debug _local2 =>
+    // LIMITED-NOT: debug _local2 =>
+}