tests: Mangle '-vg' onto the end of the triple when running under valgrind, so

we can use the standard XFAIL and XTARGET to conditional tests based on
valgrind.

llvm-svn: 99089

clang/test/lit.cfg

@@ -119,6 +119,11 @@ def inferClang(PATH):
 
     return clang
 
+# When running under valgrind, we mangle '-vg' onto the end of the triple so we
+# can check it with XFAIL and XTARGET.
+if lit.useValgrind:
+    config.target_triple += '-vg'
+
 config.clang = inferClang(config.environment['PATH'])
 if not lit.quiet:
     lit.note('using clang: %r' % config.clang)