[wasm] Revert lib/ClangImporter/ClangImporter.cpp changes

Author: kateinoigakukun

lib/ClangImporter/ClangImporter.cpp

@@ -453,42 +453,6 @@ static inline bool isPCHFilenameExtension(StringRef path) {
     .endswith(file_types::getExtension(file_types::TY_PCH));
 }
 
-static Optional<StringRef>
-getWasiLibcModuleMapPath(SearchPathOptions& Opts, llvm::Triple triple,
-                         SmallVectorImpl<char> &buffer) {
-  StringRef platform = swift::getPlatformNameForTriple(triple);
-  StringRef arch = swift::getMajorArchitectureName(triple);
-  StringRef SDKPath = Opts.getSDKPath();
-
-  if (!SDKPath.empty()) {
-    buffer.clear();
-    buffer.append(SDKPath.begin(), SDKPath.end());
-    llvm::sys::path::append(buffer, "usr", "lib", "swift");
-    llvm::sys::path::append(buffer, platform, arch, "wasi.modulemap");
-
-    // Only specify the module map if that file actually exists.  It may not;
-    // for example in the case that `swiftc -target x86_64-unknown-linux-gnu
-    // -emit-ir` is invoked using a Swift compiler not built for Linux targets.
-    if (llvm::sys::fs::exists(buffer))
-      return StringRef(buffer.data(), buffer.size());
-  }
-
-  if (!Opts.RuntimeResourcePath.empty()) {
-    buffer.clear();
-    buffer.append(Opts.RuntimeResourcePath.begin(),
-                  Opts.RuntimeResourcePath.end());
-    llvm::sys::path::append(buffer, platform, arch, "wasi.modulemap");
-
-    // Only specify the module map if that file actually exists.  It may not;
-    // for example in the case that `swiftc -target x86_64-unknown-linux-gnu
-    // -emit-ir` is invoked using a Swift compiler not built for Linux targets.
-    if (llvm::sys::fs::exists(buffer))
-      return StringRef(buffer.data(), buffer.size());
-  }
-
-  return None;
-}
-
 void
 importer::getNormalInvocationArguments(
     std::vector<std::string> &invocationArgStrs,
@@ -665,13 +629,6 @@ importer::getNormalInvocationArguments(
       });
     }
 
-    if (triple.isOSWASI()) {
-      SmallString<128> buffer;
-      if (auto path = getWasiLibcModuleMapPath(searchPathOpts, triple, buffer)) {
-        invocationArgStrs.push_back((Twine("-fmodule-map-file=") + *path).str());
-      }
-    }
-
     if (triple.isOSWindows()) {
       switch (triple.getArch()) {
       default: llvm_unreachable("unsupported Windows architecture");