Extract common memory declarations. NFC (emscripten-core#24386)

I noticed that regular preamble had types for Closure for all the memory
arrays, whereas preamble_minimal didn't but probably should.

OTOH, preamble also had unused `HEAP` variable, which preamble_minimal
correctly didn't.

Those vars + runtime{Initialized,Exited} seem easy enough to extract
into runtime_shared.js so that they stay consistent and in one place.

Author: RReverser

src/preamble.js

@@ -41,10 +41,6 @@ if (typeof WebAssembly != 'object') {
 
 // Wasm globals
 
-#if !WASM_ESM_INTEGRATION || IMPORTED_MEMORY
-var wasmMemory;
-#endif
-
 #if SHARED_MEMORY
 // For sending to workers.
 var wasmModule;
@@ -99,44 +95,6 @@ function _free() {
 #endif // free
 #endif // ASSERTIONS
 
-// Memory management
-
-var HEAP,
-/** @type {!Int8Array} */
-  HEAP8,
-/** @type {!Uint8Array} */
-  HEAPU8,
-/** @type {!Int16Array} */
-  HEAP16,
-/** @type {!Uint16Array} */
-  HEAPU16,
-/** @type {!Int32Array} */
-  HEAP32,
-/** @type {!Uint32Array} */
-  HEAPU32,
-/** @type {!Float32Array} */
-  HEAPF32,
-#if WASM_BIGINT
-/* BigInt64Array type is not correctly defined in closure
-/** not-@type {!BigInt64Array} */
-  HEAP64,
-/* BigUint64Array type is not correctly defined in closure
-/** not-t@type {!BigUint64Array} */
-  HEAPU64,
-#endif
-/** @type {!Float64Array} */
-  HEAPF64;
-
-#if SUPPORT_BIG_ENDIAN
-var HEAP_DATA_VIEW;
-#endif
-
-var runtimeInitialized = false;
-
-#if EXIT_RUNTIME
-var runtimeExited = false;
-#endif
-
 /**
  * Indicates whether filename is delivered via file protocol (as opposed to http/https)
  * @noinline
@@ -150,11 +108,6 @@ assert(typeof Int32Array != 'undefined' && typeof Float64Array !== 'undefined' &
        'JS engine does not provide full typed array support');
 #endif
 
-#if IMPORTED_MEMORY
-// In non-standalone/normal mode, we create the memory here.
-#include "runtime_init_memory.js"
-#endif // !IMPORTED_MEMORY && ASSERTIONS
-
 #if RELOCATABLE
 var __RELOC_FUNCS__ = [];
 #endif

src/preamble_minimal.js

@@ -25,28 +25,9 @@ var tempI64;
 #if WASM2JS && WASM != 2
 // WASM == 2 includes wasm2js.js separately.
 #include "wasm2js.js"
+#if !WASM2JS
+}
 #endif
-
-var HEAP8, HEAP16, HEAP32, HEAPU8, HEAPU16, HEAPU32, HEAPF32, HEAPF64,
-#if WASM_BIGINT
-  HEAP64, HEAPU64,
-#endif
-#if SUPPORT_BIG_ENDIAN
-  HEAP_DATA_VIEW,
-#endif
-  wasmMemory;
-
-#if ASSERTIONS || SAFE_HEAP || USE_ASAN || MODULARIZE
-var runtimeInitialized = false;
-#endif
-
-#if EXIT_RUNTIME
-var runtimeExited = false;
 #endif
 
 #include "runtime_shared.js"
-
-#if IMPORTED_MEMORY
-#include "runtime_init_memory.js"
-initMemory();
-#endif

src/runtime_init_memory.js

@@ -54,6 +54,6 @@ function initMemory() {
   updateMemoryViews();
 }
 
-#if WASM_ESM_INTEGRATION
+#if WASM_ESM_INTEGRATION || MINIMAL_RUNTIME
 initMemory();
 #endif

src/runtime_shared.js

@@ -7,7 +7,6 @@
 #include "runtime_stack_check.js"
 #include "runtime_exceptions.js"
 #include "runtime_debug.js"
-#include "memoryprofiler.js"
 
 #if SAFE_HEAP
 #include "runtime_safe_heap.js"
@@ -65,6 +64,53 @@ var wasmOffsetConverter;
 #include "wasm_offset_converter.js"
 #endif
 
+// Memory management
+
+#if !WASM_ESM_INTEGRATION || IMPORTED_MEMORY
+var wasmMemory;
+#endif
+
+var
+/** @type {!Int8Array} */
+  HEAP8,
+/** @type {!Uint8Array} */
+  HEAPU8,
+/** @type {!Int16Array} */
+  HEAP16,
+/** @type {!Uint16Array} */
+  HEAPU16,
+/** @type {!Int32Array} */
+  HEAP32,
+/** @type {!Uint32Array} */
+  HEAPU32,
+/** @type {!Float32Array} */
+  HEAPF32,
+/** @type {!Float64Array} */
+  HEAPF64;
+
+#if WASM_BIGINT
+// BigInt64Array type is not correctly defined in closure
+var
+/** not-@type {!BigInt64Array} */
+  HEAP64,
+/* BigUint64Array type is not correctly defined in closure
+/** not-@type {!BigUint64Array} */
+  HEAPU64;
+#endif
+
+#if SUPPORT_BIG_ENDIAN
+/** @type {!DataView} */
+var HEAP_DATA_VIEW;
+#endif
+
+#if !MINIMAL_RUNTIME || ASSERTIONS || SAFE_HEAP || USE_ASAN || MODULARIZE
+var runtimeInitialized = false;
+#endif
+
+#if EXIT_RUNTIME
+var runtimeExited = false;
+#endif
+
 {{{
   // Helper function to export a heap symbol on the module object,
   // if requested.
@@ -116,3 +162,10 @@ if (ENVIRONMENT_IS_NODE) {
   global.performance ??= require('perf_hooks').performance;
 }
 #endif
+
+#if IMPORTED_MEMORY
+// In non-standalone/normal mode, we create the memory here.
+#include "runtime_init_memory.js"
+#endif // !IMPORTED_MEMORY && ASSERTIONS
+
+#include "memoryprofiler.js"