Remove Emscripten support

include/clang/Basic/TargetCXXABI.h

Index: include/clang/Basic/TargetCXXABI.h
diff --git a/include/clang/Basic/TargetCXXABI.h b/include/clang/Basic/TargetCXXABI.h
index 671778a207cefb36d00e12bc8a13bc4cc4691cd4..42a976b3afdeb420d92cd700c504cada36c3ce85 100644
--- a/include/clang/Basic/TargetCXXABI.h
+++ b/include/clang/Basic/TargetCXXABI.h
@@ -79,11 +79,6 @@ public:
     ///   - guard variables  are smaller.
     GenericAArch64,
 
-    // @LOCALMOD-START Emscripten
-    /// Emscripten uses the Itanium C++, with the exception that it uses
-    /// ARM-style pointers to member functions.
-    Emscripten,
-    // @LOCALMOD-END Emscripten
     /// The generic Mips ABI is a modified version of the Itanium ABI.
     ///
     /// At the moment, only change from the generic ABI in this case is:
@@ -123,7 +118,6 @@ public:
     case GenericAArch64:
     case GenericItanium:
     case GenericARM:
-    case Emscripten: // @LOCALMOD Emscripten
     case iOS:
     case iOS64:
     case GenericMIPS:
@@ -141,7 +135,6 @@ public:
     case GenericAArch64:
     case GenericItanium:
     case GenericARM:
-    case Emscripten: // @LOCALMOD Emscripten
     case iOS:
     case iOS64:
     case GenericMIPS:
@@ -153,30 +146,6 @@ public:
     llvm_unreachable("bad ABI kind");
   }
 
-  // @LOCALMOD-START Emscripten
-  /// \brief Are pointers to member functions differently aligned?
-  bool arePointersToMemberFunctionsAligned() const {
-    switch (getKind()) {
-    case Emscripten:
-      // Emscripten uses table indices for function pointers and therefore
-      // doesn't require alignment.
-      return false;
-    case GenericARM:
-    case GenericAArch64:
-      // TODO: ARM-style pointers to member functions put the discriminator in
-      //       the this adjustment, so they don't require functions to have any
-      //       special alignment and could therefore also return false.
-    case GenericItanium:
-    case GenericMIPS:
-    case iOS:
-    case iOS64:
-    case Microsoft:
-      return true;
-    }
-    llvm_unreachable("bad ABI kind");
-  }
-  // @LOCALMOD-END Emscripten
-
   /// \brief Is the default C++ member function calling convention
   /// the same as the default calling convention?
   bool isMemberFunctionCCDefault() const {
@@ -249,7 +218,6 @@ public:
 
     case GenericAArch64:
     case GenericItanium:
-    case Emscripten: // @LOCALMOD Emscripten
     case iOS:   // old iOS compilers did not follow this rule
     case Microsoft:
     case GenericMIPS:
@@ -297,7 +265,6 @@ public:
     case GenericItanium:
     case GenericAArch64:
     case GenericARM:
-    case Emscripten: // @LOCALMOD Emscripten
     case iOS:
     case GenericMIPS:
       return UseTailPaddingUnlessPOD03;