[WebAssembly] Merge eh-assembly-legacy.s into eh-assembly.s (llvm#111411)

Now that we don't need to specify `--no-type-check` on `eh-assembly.s`,
we can test the two modes in the same file.

Author: aheejin

llvm/test/MC/WebAssembly/eh-assembly-legacy.s

@@ -82,9 +82,58 @@ eh_test:
   end_try_table
   drop
   drop
+  end_function
+
+eh_legacy_test:
+  .functype  eh_legacy_test () -> ()
+
+  # try-catch with catch, catch_all, throw, and rethrow
+  try
+    i32.const 3
+    throw     __cpp_exception
+  catch       __cpp_exception
+    drop
+    rethrow 0
+  catch       __c_longjmp
+    drop
+  catch_all
+    rethrow 0
+  end_try
+
+  # Nested try-catch with a rethrow
+  try
+    call  foo
+  catch_all
+    try
+    catch_all
+      rethrow 1
+    end_try
+  end_try
+
+  # try-catch with a single return value
+  try i32
+    i32.const 0
+  catch       __cpp_exception
+  end_try
+  drop
+
+  # try-catch with a mulvivalue return
+  try () -> (i32, f32)
+    i32.const 0
+    f32.const 0.0
+  catch       __cpp_exception
+    f32.const 1.0
+  end_try
+  drop
+  drop
 
+  # Catch-less try
+  try
+    call  foo
+  end_try
   end_function
 
+
 # CHECK-LABEL: eh_test:
 # CHECK:         block           exnref
 # CHECK-NEXT:    block
@@ -153,3 +202,44 @@ eh_test:
 # CHECK-NEXT:    end_try_table
 # CHECK-NEXT:    drop
 # CHECK-NEXT:    drop
+
+# CHECK:       eh_legacy_test:
+# CHECK:         try
+# CHECK-NEXT:    i32.const       3
+# CHECK-NEXT:    throw           __cpp_exception
+# CHECK-NEXT:    catch           __cpp_exception
+# CHECK-NEXT:    drop
+# CHECK-NEXT:    rethrow         0
+# CHECK-NEXT:    catch           __c_longjmp
+# CHECK-NEXT:    drop
+# CHECK-NEXT:    catch_all
+# CHECK-NEXT:    rethrow         0
+# CHECK-NEXT:    end_try
+
+# CHECK:         try
+# CHECK-NEXT:    call    foo
+# CHECK-NEXT:    catch_all
+# CHECK-NEXT:    try
+# CHECK-NEXT:    catch_all
+# CHECK-NEXT:    rethrow         1
+# CHECK-NEXT:    end_try
+# CHECK-NEXT:    end_try
+
+# CHECK:         try             i32
+# CHECK-NEXT:    i32.const       0
+# CHECK-NEXT:    catch           __cpp_exception
+# CHECK-NEXT:    end_try
+# CHECK-NEXT:    drop
+
+# CHECK:         try             () -> (i32, f32)
+# CHECK-NEXT:    i32.const       0
+# CHECK-NEXT:    f32.const       0x0p0
+# CHECK-NEXT:    catch           __cpp_exception
+# CHECK-NEXT:    f32.const       0x1p0
+# CHECK-NEXT:    end_try
+# CHECK-NEXT:    drop
+# CHECK-NEXT:    drop
+
+# CHECK:         try
+# CHECK-NEXT:    call    foo
+# CHECK-NEXT:    end_try