[Wasm64] Enable import/export name minification with MEMORY64 (emscripten-core#18897)

Also add a new code size test that uses MEMORY64.

Author: sbc100

emcc.py

@@ -2538,16 +2538,13 @@ def check_memory_setting(setting):
   if settings.SHARED_MEMORY or settings.RELOCATABLE or settings.ASYNCIFY_LAZY_LOAD_CODE or settings.WASM2JS:
     settings.IMPORTED_MEMORY = 1
 
-  # Any "pointers" passed to JS will now be i64's, in both modes.
-  # Also turn off minifying, which clashes with instrumented functions in preamble.js
   if settings.MEMORY64:
     if settings.ASYNCIFY and settings.MEMORY64 == 1:
       exit_with_error('MEMORY64=1 is not compatible with ASYNCIFY')
     if not settings.DISABLE_EXCEPTION_CATCHING:
       exit_with_error('MEMORY64 is not compatible with DISABLE_EXCEPTION_CATCHING=0')
+    # Any "pointers" passed to JS will now be i64's, in both modes.
     settings.WASM_BIGINT = 1
-    settings.MINIFY_WASM_IMPORTS_AND_EXPORTS = 0
-    settings.MINIFY_WASM_IMPORTED_MODULES = 0
 
   if settings.WASM_BIGINT:
     settings.LEGALIZE_JS_FFI = 0

test/other/metadce/test_metadce_minimal_64.exports

@@ -0,0 +1,4 @@
+a
+b
+c
+d

test/other/metadce/test_metadce_minimal_64.funcs

@@ -0,0 +1,2 @@
+$__wasm_call_ctors
+$add

test/other/metadce/test_metadce_minimal_64.imports

@@ -0,0 +1 @@
+

test/other/metadce/test_metadce_minimal_64.jssize

@@ -0,0 +1 @@
+4077

test/other/metadce/test_metadce_minimal_64.sent

@@ -0,0 +1 @@
+

test/other/metadce/test_metadce_minimal_64.size

@@ -0,0 +1 @@
+302

test/test_other.py

@@ -7787,6 +7787,7 @@ def strip_numeric_suffixes(funcname):
     'Os_mr': (['-Os', '-sMINIMAL_RUNTIME'], [], [], 74), # noqa
     # EVAL_CTORS also removes the __wasm_call_ctors function
     'Oz-ctors': (['-Oz', '-sEVAL_CTORS'], [], []), # noqa
+    '64': (['-Oz', '-sMEMORY64', '-Wno-experimental'], [], []), # noqa
   })
   def test_metadce_minimal(self, *args):
     self.set_setting('INCOMING_MODULE_JS_API', [])