allow specific test for make check

Makefile.standalone-help/check-lit.txt

Index: Makefile.standalone-help/check-lit.txt
diff --git a/Makefile.standalone-help/check-lit.txt b/Makefile.standalone-help/check-lit.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e9c5e2d0dad8aaa768ef46226c6266d01d718d15
--- /dev/null
+++ b/Makefile.standalone-help/check-lit.txt
@@ -0,0 +1,7 @@
+

[Jim Stichnoth, 2016/01/22 03:05:21]

In all these .txt files, please remove leading and trailing blank lines to
silence git complaints.  If you want more distinct separation, either echo blank
lines at a higher level, or use a line of all '----' or '====' here, or ...

Also in all these .txt files, please follow the 80-col limit.

[rkotlerimgtec, 2016/01/22 03:48:30]

Done.

+check-lit - run the lit tests
+
+to check a specific test, override CHECK_LIT_TESTS

[Jim Stichnoth, 2016/01/22 03:05:21]

Here I would clean up capitalization, line breaks, etc.:

To check a specific test, override CHECK_LIT_TESTS, e.g.:
  make -f Makefile.standalone check-lit \
    CHECK_LIT_TESTS=tests_lit/llvm2ice_tests/arith.ll

Same comment for the other .txt files.

[rkotlerimgtec, 2016/01/22 03:48:31]

Done.

+i.e. make -f Makefile.standalone check-lit CHECK_LIT_TESTS=tests_lit/llvm2ice_tests/arith.ll
+
+