Add a basic TargetARM32 skeleton which knows nothing.

Makefile.standalone

 # The following variables will likely need to be modified, depending on where
 # and how you built LLVM & Clang. They can be overridden in a command-line
 # invocation of make, like:
 #
 #   make LLVM_SRC_PATH=<path> LLVM_BIN_PATH=<path> \
 #        LIBCXX_INSTALL_PATH=<path> CLANG_PATH=<path> \
 #        PNACL_BIN_PATH=<path> ...
 #
 
 # LLVM_SRC_PATH is the path to the root of the checked out source code. This
@@ skipping 157 matching lines @@
         IceGlobalContext.cpp \
         IceGlobalInits.cpp \
         IceInst.cpp \
         IceInstX8632.cpp \
         IceIntrinsics.cpp \
         IceLiveness.cpp \
         IceOperand.cpp \
         IceRegAlloc.cpp \
         IceRNG.cpp \
         IceTargetLowering.cpp \
+        IceTargetLoweringARM32.cpp \
         IceTargetLoweringX8632.cpp \
         IceThreading.cpp \
         IceTimerTree.cpp \
         IceTranslator.cpp \
         IceTypes.cpp \
         main.cpp \
         PNaClTranslator.cpp
 
 ifndef MINIMAL
   SRCS += IceConverter.cpp \
@@ skipping 128 matching lines @@
 bloat: make_symlink
         nm -C -S -l pnacl-sz | \
         bloat/bloat.py --nm-output=/dev/stdin syms > build/pnacl-sz.bloat.json
         @echo See Subzero size breakdown in bloat/pnacl-sz.bloat.html
 
 clean:
         rm -rf pnacl-sz *.o $(OBJDIR) $(SB_OBJDIR) build/pnacl-sz.bloat.json
 
 clean-all: clean
         rm -rf build/