Fix wasm2js memory import in case it is minified (#3113)

It was hardcoded as "env.memory", which is usually correct. But if we minify
import names, as in -O3 in emscripten, we need to use the minified name.

Note how in the test it now emits

var memory = env.a;
for the import.

Fixes emscripten-core/emscripten#12123

This was not noticed earlier since that import is only used in memory
growth. The tests that would catch it are wasm2js3.test*memory_growth*
but we only run wasm2js1 on CI. I'll add testing after this lands.

1 files changed, 6 insertions, 0 deletions

diff --git a/test/wasm2js/minified-memory.wast b/test/wasm2js/minified-memory.wast
new file mode 100644
index 000000000..0fc1e3018
--- /dev/null
+++ b/test/wasm2js/minified-memory.wast
@@ -0,0 +1,6 @@
+(module
+ (import "env" "a" (memory $0 1))
+ (func "foo" (result i32)
+  (i32.load (i32.const 0))
+ )
+)