[embedded] Use defined(__wasm__) instead of defined(__wasi__) in Visibility.h

Author: kubamracek

lib/ClangImporter/ClangImporter.cpp

@@ -638,9 +638,6 @@ importer::getNormalInvocationArguments(
     if (triple.isOSBinFormatMachO()) {
       invocationArgStrs.insert(invocationArgStrs.end(), {"-D__MACH__"});
     }
-    if (triple.isOSBinFormatWasm()) {
-      invocationArgStrs.insert(invocationArgStrs.end(), {"-D__wasi__"});
-    }
 
     if (triple.isOSWindows()) {
       switch (triple.getArch()) {

stdlib/public/SwiftShims/swift/shims/Visibility.h

@@ -134,7 +134,7 @@
 // right for Windows, we have everything set up to get it right on
 // other targets as well, and doing so lets the compiler use more
 // efficient symbol access patterns.
-#if defined(__MACH__) || defined(__wasi__)
+#if defined(__MACH__) || defined(__wasm__)
 
 // On Mach-O and WebAssembly, we use non-hidden visibility.  We just use
 // default visibility on both imports and exports, both because these