Update clang to r84119.

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+//===----------------------------------------------------------------------===//
+// Clang Installation Instructions
+//===----------------------------------------------------------------------===//
+
+These instructions describe how to build and install Clang.
+
+//===----------------------------------------------------------------------===//
+// Step 1: Organization
+//===----------------------------------------------------------------------===//
+
+Clang is designed to be built as part of an LLVM build. Assuming that the LLVM
+source code is located at $LLVM_SRC_ROOT, then the clang source code should be
+installed as:
+
+  $LLVM_SRC_ROOT/tools/clang
+
+The directory is not required to be called clang, but doing so will allow the
+LLVM build system to automatically recognize it and build it along with LLVM.
+
+//===----------------------------------------------------------------------===//
+// Step 2: Configure and Build LLVM
+//===----------------------------------------------------------------------===//
+
+Configure and build your copy of LLVM (see $LLVM_SRC_ROOT/GettingStarted.html
+for more information).
+
+Assuming you installed clang at $LLVM_SRC_ROOT/tools/clang then Clang will
+automatically be built with LLVM. Otherwise, run 'make' in the Clang source
+directory to build Clang.
+
+//===----------------------------------------------------------------------===//
+// Step 3: (Optional) Verify Your Build
+//===----------------------------------------------------------------------===//
+
+It is a good idea to run the Clang tests to make sure your build works
+correctly. From inside the Clang build directory, run 'make test' to run the
+tests.
+
+//===----------------------------------------------------------------------===//
+// Step 4: Install Clang
+//===----------------------------------------------------------------------===//
+
+From inside the Clang build directory, run 'make install' to install the Clang
+compiler and header files into the prefix directory selected when LLVM was
+configured.
+
+The Clang compiler is available as 'clang' and supports a gcc like command line
+interface. See the man page for clang (installed into $prefix/share/man/man1)
+for more information.