message: Add -toolchain-stdlib-rpath
  This fixes the LLDB test suite after Jordan's change to the RPATH for
  Swift support in the OS.
diff: @@ -670,7 +670,7 @@ VPATHSOURCES=$(patsubst %,$(VPATH)/%,$(SWIFT_SOURCES))
  ifeq "$(OS)" "Darwin"
  $(EXE): $(MODULENAME).swiftmodule $(OBJECTS)
  @echo "### Linking" $(EXE)
  - $(SWIFTC) $(STATIC_STDLIB) $(LD_EXTRAS) \
  + $(SWIFTC) -toolchain-stdlib-rpath $(STATIC_STDLIB) $(LD_EXTRAS) \
  $(patsubst $<,-Xlinker -add_ast_path -Xlinker $(BUILDDIR)/$<,$^) \
  $(patsubst -g,,$(SWIFTFLAGS)) -o "$(EXE)"
  ifneq "$(CODESIGN)" ""
  