Remove Emscripten support

lib/Driver/ToolChains.h

Index: lib/Driver/ToolChains.h
diff --git a/lib/Driver/ToolChains.h b/lib/Driver/ToolChains.h
index c3918d81a79716dd176f2f96ecb4b1e8eed9502d..33c97b2f3d2e44230e1f7a8d231d7ca0a80df5d1 100644
--- a/lib/Driver/ToolChains.h
+++ b/lib/Driver/ToolChains.h
@@ -716,23 +716,6 @@ public:
   static StringRef GetTargetCPU(const llvm::opt::ArgList &Args);
 };
 
-// @LOCALMOD-START Emscripten
-/// EmscriptenToolChain - A toolchain for the Emscripten C/C++ to JS compiler.
-class LLVM_LIBRARY_VISIBILITY EmscriptenToolChain : public ToolChain {
-public:
-  EmscriptenToolChain(const Driver &D, const llvm::Triple &Triple,
-                      const llvm::opt::ArgList &Args)
-      : ToolChain(D, Triple, Args) {}
-  ~EmscriptenToolChain() override {}
-
-  bool IsMathErrnoDefault() const override { return false; }
-  bool IsObjCNonFragileABIDefault() const override { return true; }
-  bool isPICDefault() const override { return false; }
-  bool isPIEDefault() const override { return false; }
-  bool isPICDefaultForced() const override { return false; }
-};
-// @LOCALMOD-END Emscripten
-
 class LLVM_LIBRARY_VISIBILITY NaCl_TC : public Generic_ELF {
 public:
   NaCl_TC(const Driver &D, const llvm::Triple &Triple,