rollup merge of rust-lang#20230: bheesham/noshard

I forgot to do this in my previous PR. This should close rust-lang#19145 .

Author: alexcrichton

mk/tests.mk

@@ -74,14 +74,6 @@ endif
 TEST_LOG_FILE=tmp/check-stage$(1)-T-$(2)-H-$(3)-$(4).log
 TEST_OK_FILE=tmp/check-stage$(1)-T-$(2)-H-$(3)-$(4).ok
 
-# If we're sharding the testsuite between parallel testers,
-# pass this argument along to the compiletest and crate test
-# invocations.
-ifdef TEST_SHARD
-  CTEST_TESTARGS += --test-shard=$(TEST_SHARD)
-  CRATE_TEST_EXTRA_ARGS += --test-shard=$(TEST_SHARD)
-endif
-
 define DEF_TARGET_COMMANDS
 
 ifdef CFG_UNIXY_$(1)