Remove Emscripten support

lib/CodeGen/ItaniumCXXABI.cpp

Index: lib/CodeGen/ItaniumCXXABI.cpp
diff --git a/lib/CodeGen/ItaniumCXXABI.cpp b/lib/CodeGen/ItaniumCXXABI.cpp
index 6de05f2670d4b90656064eb69c0a62aa79a1dfc6..73164bb252e6c6581f7d0eaf110d9d200923b897 100644
--- a/lib/CodeGen/ItaniumCXXABI.cpp
+++ b/lib/CodeGen/ItaniumCXXABI.cpp
@@ -358,14 +358,6 @@ CodeGen::CGCXXABI *CodeGen::CreateItaniumCXXABI(CodeGenModule &CGM) {
   case TargetCXXABI::GenericMIPS:
     return new ItaniumCXXABI(CGM, /* UseARMMethodPtrABI = */ true);
 
-  // @LOCALMOD-START Emscripten
-  case TargetCXXABI::Emscripten:
-    // Use ARM-style method pointers so that generated code does not assume
-    // anything about the alignment of function pointers.
-    return new ItaniumCXXABI(CGM, /* UseARMMethodPtrABI = */ true,
-                             /* UseARMGuardVarABI = */ false);
-  // @LOCALMOD-END Emscripten
-
   case TargetCXXABI::GenericItanium:
     if (CGM.getContext().getTargetInfo().getTriple().getArch()
         == llvm::Triple::le32) {