Subzero: Add a check-lit target for faster smoke testing.

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> ...
 #
 
 # 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/
 # directories of LLVM, Clang in tools/clang/, etc.
@@ skipping 65 matching lines @@
 
 # TODO: Be more precise than "*.h" here and elsewhere.
 $(OBJS): build/%.o: src/%.cpp src/*.h src/*.def
         $(CXX) -c $(CXXFLAGS) $< -o $@
 
 $(OBJS): | build
 
 build:
         @mkdir -p $@
 
-check: llvm2ice
+check-lit: llvm2ice
         LLVM_BIN_PATH=$(LLVM_BIN_PATH) \
         $(LLVM_SRC_PATH)/utils/lit/lit.py -sv tests_lit
+
+check: check-lit
         (cd crosstest; LLVM_BIN_PATH=$(LLVM_BIN_PATH) ./runtests.sh)
 
 # TODO: Fix the use of wildcards.
 # Assumes clang-format is within $PATH.
 format:
         clang-format -style=LLVM -i src/*.h src/*.cpp
 
 # Assumes clang-format-diff.py is within $PATH, and that the
 # clang-format it calls is also within $PATH.  This may require adding
 # a component to $PATH, or creating symlinks within some existing
 # $PATH component.  Uses the one in /usr/lib/clang-format/ if it
 # exists.
 ifeq (,$(wildcard /usr/lib/clang-format/clang-format-diff.py))
   CLANG_FORMAT_DIFF = clang-format-diff.py
 else
   CLANG_FORMAT_DIFF = /usr/lib/clang-format/clang-format-diff.py
 endif
 format-diff:
         git diff -U0 `git merge-base HEAD master` | \
         $(CLANG_FORMAT_DIFF) -p1 -style=LLVM -i
 
 clean:
         rm -rf llvm2ice *.o build/