Implemented linking to a dummy ASan runtime

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> 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
 # directory should contain the configure script, the include/ and lib/
@@ skipping 483 matching lines @@
 $(OBJDIR)/unittest: $(OBJDIR)
         @mkdir -p $@
 
 $(OBJDIR)/unittest/AssemblerX8632: $(OBJDIR)/unittest
         @mkdir -p $@
 $(OBJDIR)/unittest/AssemblerX8664: $(OBJDIR)/unittest
         @mkdir -p $@
 
 RT_SRC := runtime/szrt.c runtime/szrt_ll.ll runtime/szrt_profiler.c \
           runtime/szrt_asm_x8632.s runtime/szrt_asm_x8664.s \
-          runtime/szrt_asm_arm32.s
+          runtime/szrt_asm_arm32.s runtime/szrt_asan.c
 RT_OBJ := build/runtime/szrt_native_x8632.o build/runtime/szrt_sb_x8632.o \
           build/runtime/szrt_nonsfi_x8632.o \
           build/runtime/szrt_native_x8664.o build/runtime/szrt_sb_x8664.o \
           build/runtime/szrt_nonsfi_x8664.o \
           build/runtime/szrt_native_arm32.o build/runtime/szrt_sb_arm32.o \
-          build/runtime/szrt_nonsfi_arm32.o
+          build/runtime/szrt_nonsfi_arm32.o \
+          build/runtime/szrt_asan_x8632.o build/runtime/szrt_asan_x8664.o \
+          build/runtime/szrt_asan_arm32.o
 
 runtime: $(RT_OBJ)
 
 # Use runtime.is.built so that build-runtime.py is invoked only once
 # even in a parallel build.
 .INTERMEDIATE: runtime.is.built
 $(RT_OBJ): runtime.is.built
 runtime.is.built: $(RT_SRC) pydir/build-runtime.py
         @echo ================ Building Subzero runtime ================
         ./pydir/build-runtime.py -v --pnacl-root $(PNACL_TOOLCHAIN_ROOT)
@@ skipping 259 matching lines @@
 
 help-check-xtest:
         @cat Makefile.standalone-help/check-xtest.txt
 
 clean:
         rm -rf pnacl-sz *.o $(foreach nexe,$(NEXES),$(notdir $(nexe))) \
           $(OBJDIR) $(SB_OBJDIR) $(SBB_OBJDIR) build/*.bloat.json
 
 clean-all: clean
         rm -rf build/ crosstest/Output/