custom-page-sizes: a few test wat

wat/custom-page-sizes/1.wat

@@ -0,0 +1,20 @@
+(module
+  (func (export "_start")
+    ;; memory.grow here is expected to fail because it's already max-sized.
+    i32.const 1
+    memory.grow 0
+    i32.const -1
+    i32.ne
+    if
+      unreachable
+    end
+
+    memory.size 0
+    i32.const -1
+    i32.ne
+    if
+      unreachable
+    end
+  )
+  (memory 0xffffffff (pagesize 1))
+)

wat/custom-page-sizes/16.wat

@@ -0,0 +1,4 @@
+(module
+  (func (export "_start"))
+  (memory 0x10000 0x10000 (pagesize 65536))
+)

wat/custom-page-sizes/trap.wat

@@ -0,0 +1,33 @@
+(module
+  (func (export "i32-ok")
+    i32.const 27
+    i32.load
+    drop
+  )
+  (func $i32-trap (export "i32-trap")
+    i32.const 28
+    i32.load
+    drop
+  )
+  (func (export "i8-ok")
+    i32.const 30
+    i32.load8_u
+    drop
+  )
+  (func (export "i8-trap")
+    i32.const 31
+    i32.load8_u
+    drop
+  )
+  (func (export "i32-ok-after-grow")
+    i32.const 1
+    memory.grow
+    i32.const -1
+    i32.eq
+    if
+      unreachable
+    end
+    call $i32-trap
+  )
+  (memory 31 (pagesize 1))
+)