[EH] Convert EH tests into lit tests (#3923)

This converts most EH tests in test/passes into test/lit/passes. Fixed
some files to follow 2-space indentation and improved some comments.

1 files changed, 30 insertions, 0 deletions

diff --git a/test/lit/passes/remove-unused-module-elements-eh.wast b/test/lit/passes/remove-unused-module-elements-eh.wast
new file mode 100644
index 000000000..7e0c66af4
--- /dev/null
+++ b/test/lit/passes/remove-unused-module-elements-eh.wast
@@ -0,0 +1,30 @@
+;; RUN: wasm-opt %s --remove-unused-module-elements -all -S -o - | filecheck %s
+
+;; Non-exported and unused events can be removed
+(module
+  (type $0 (func (param i32)))
+
+  ;; CHECK-NOT: (event $e-remove
+  ;; CHECK: (event $e-export
+  ;; CHECK: (event $e-throw
+  ;; CHECK: (event $e-catch
+  (event $e-remove (attr 0) (type $0))   ;; can be removed
+  (event $e-export (attr 0) (param i64)) ;; cannot be removed (exported)
+  (event $e-throw (attr 0) (type $0))    ;; cannot be removed (used in throw)
+  (event $e-catch (attr 0) (type $0))    ;; cannot be removed (used in catch)
+
+  (export "e-export" (event $e-export))
+  (import "env" "e" (event $e-import (attr 0) (param i32)))
+
+  (start $start)
+  (func $start
+    (try
+      (do
+        (throw $e-throw (i32.const 0))
+      )
+      (catch $e-catch
+        (drop (pop i32))
+      )
+    )
+  )
+)