[wasm][Driver] HACK: Add -use-static-resource-dir by default for wasm target

Currently, wasm target only supports static linking mode, so we add
`-use-static-resource-dir` by default for wasm target. This patch is not
an essential change because we can also add `-use-static-resource-dir`
in the driver invocation. But it is a convenient change for users.

Author: kateinoigakukun

lib/Driver/Driver.cpp

@@ -2403,7 +2403,8 @@ bool Driver::handleImmediateArgs(const ArgList &Args, const ToolChain &TC) {
     if (Args.hasFlag(options::OPT_static_executable,
                      options::OPT_no_static_executable, false) ||
         Args.hasFlag(options::OPT_static_stdlib, options::OPT_no_static_stdlib,
-                     false)) {
+                     false) ||
+        TC.getTriple().isOSBinFormatWasm()) {
       commandLine.push_back("-use-static-resource-dir");
     }
 

lib/Driver/ToolChains.cpp

@@ -634,7 +634,8 @@ ToolChain::constructInvocation(const CompileJobAction &job,
   if (context.Args.hasFlag(options::OPT_static_executable,
                            options::OPT_no_static_executable, false) ||
       context.Args.hasFlag(options::OPT_static_stdlib,
-                           options::OPT_no_static_stdlib, false)) {
+                           options::OPT_no_static_stdlib, false) ||
+      getTriple().isOSBinFormatWasm()) {
     Arguments.push_back("-use-static-resource-dir");
   }
 
@@ -1162,7 +1163,13 @@ ToolChain::constructInvocation(const MergeModuleJobAction &job,
   context.Args.AddLastArg(Arguments, options::OPT_import_objc_header);
 
   context.Args.AddLastArg(Arguments, options::OPT_disable_incremental_imports);
-
+  if (context.Args.hasFlag(options::OPT_static_executable,
+                            options::OPT_no_static_executable, false) ||
+      context.Args.hasFlag(options::OPT_static_stdlib,
+                            options::OPT_no_static_stdlib, false) ||
+      getTriple().isOSBinFormatWasm()) {
+    Arguments.push_back("-use-static-resource-dir");
+  }
   Arguments.push_back("-module-name");
   Arguments.push_back(context.Args.MakeArgString(context.OI.ModuleName));
 
@@ -1362,6 +1369,14 @@ ToolChain::constructInvocation(const GeneratePCHJobAction &job,
   addInputsOfType(Arguments, context.InputActions, file_types::TY_ClangHeader);
   context.Args.AddLastArg(Arguments, options::OPT_index_store_path);
 
+  if (context.Args.hasFlag(options::OPT_static_executable,
+                   options::OPT_no_static_executable, false) ||
+      context.Args.hasFlag(options::OPT_static_stdlib, options::OPT_no_static_stdlib,
+                   false) ||
+      getTriple().isOSBinFormatWasm()) {
+    Arguments.push_back("-use-static-resource-dir");
+  }
+
   if (job.isPersistentPCH()) {
     Arguments.push_back("-emit-pch");
     Arguments.push_back("-pch-output-dir");