wasm-decompile doesn't mark standard exported globals as exported

I've compiled a simple example with Clang 8.0.1:

int f() {
	return 42;
}

With latest wabt release (1.0.13), wasm2wat dump for this file is:

(module
  (type (;0;) (func))
  (func $__wasm_call_ctors (type 0))
  (table (;0;) 1 1 funcref)
  (memory (;0;) 2)
  (global (;0;) (mut i32) (i32.const 66560))
  (global (;1;) i32 (i32.const 66560))
  (global (;2;) i32 (i32.const 1024))
  (export "memory" (memory 0))
  (export "__heap_base" (global 1))
  (export "__data_end" (global 2)))

while wasm-decompile prints:

export memory memory(initial: 2, max: 0);

global g_a:int = 66560;
global heap_base:int = 66560;
global data_end:int = 1024;

table T_a:funcref(min: 1, max: 1);

function wasm_call_ctors() {
}

Note how globals are not marked as exported, even though they are as shown by wasm2wat.

Start with the wasm-decompile output path and compare it with the wasm2wat output shown in the issue. Trace how exported globals are represented, then ensure standard exported globals are marked as exported in decompiled output and verify the example no longer omits those export markers.