Separate the PNaCl llc into a tool named pnacl-llc (how original!)

tools/Makefile

 ##===- tools/Makefile --------------------------------------*- Makefile -*-===##
 #
 #                     The LLVM Compiler Infrastructure
 #
 # This file is distributed under the University of Illinois Open Source
 # License. See LICENSE.TXT for details.
 #
 ##===----------------------------------------------------------------------===##
 
 LEVEL := ..
@@ skipping 10 matching lines @@
 
 # Build LLDB if present. Note LLDB must be built last as it depends on the
 # wider LLVM infrastructure (including Clang).
 OPTIONAL_DIRS := lldb
 
 # NOTE: The tools are organized into five groups of four consisting of one
 # large and three small executables. This is done to minimize memory load
 # in parallel builds.  Please retain this ordering.
 DIRS := llvm-config
 PARALLEL_DIRS := opt llvm-as llvm-dis \
-                 llc llvm-ranlib llvm-ar llvm-nm \
+                 llc pnacl-llc llvm-ranlib llvm-ar llvm-nm \
                  llvm-prof llvm-link \
                  lli llvm-extract llvm-mc \
                  bugpoint llvm-bcanalyzer \
                  llvm-diff macho-dump llvm-objdump llvm-readobj \
                  llvm-rtdyld llvm-dwarfdump llvm-cov \
                  llvm-size llvm-stress llvm-mcmarkup bc-wrap pso-stub \
                  llvm-symbolizer pnacl-abicheck pnacl-bcanalyzer pnacl-freeze \
                  pnacl-thaw
 
 # If Intel JIT Events support is configured, build an extra tool to test it.
@@ skipping 30 matching lines @@
 
 # On Win32, loadable modules can be built with ENABLE_SHARED.
 ifneq ($(ENABLE_SHARED),1)
   ifneq (,$(filter $(HOST_OS), Cygwin MingW))
     PARALLEL_DIRS := $(filter-out bugpoint-passes, \
                         $(PARALLEL_DIRS))
   endif
 endif
 
 include $(LEVEL)/Makefile.common