Wasi followups to #2323 (#2329)

Remove wasi, as only wasi_unstable makes sense. Also remove shared constant for wasi as we don't know yet if it'll be needed later.

Author: kripken

src/passes/MinifyImportsAndExports.cpp

@@ -41,6 +41,8 @@
 
 namespace wasm {
 
+static Name WASI_UNSTABLE("wasi_unstable");
+
 struct MinifyImportsAndExports : public Pass {
   bool minifyExports;
 
@@ -160,8 +162,7 @@ struct MinifyImportsAndExports : public Pass {
       }
     };
     auto processImport = [&](Importable* curr) {
-      if (curr->module == ENV || curr->module == WASI ||
-          curr->module == WASI_UNSTABLE) {
+      if (curr->module == ENV || curr->module == WASI_UNSTABLE) {
         process(curr->base);
       }
     };

src/shared-constants.h

@@ -65,8 +65,6 @@ extern Name EXIT;
 extern Name SHARED;
 extern Name EVENT;
 extern Name ATTR;
-extern Name WASI;
-extern Name WASI_UNSTABLE;
 
 } // namespace wasm
 

src/wasm/wasm.cpp

@@ -88,8 +88,6 @@ Name EXIT("exit");
 Name SHARED("shared");
 Name EVENT("event");
 Name ATTR("attr");
-Name WASI("wasi");
-Name WASI_UNSTABLE("wasi_unstable");
 
 // Expressions