Testsuite: use ignore_stderr/stdout instead of ignore_output

The problem with ignore_output is that it hides errors for WAY=ghci.
GHCi always returns with exit code 0 (unless it is broken itself).

For example: ghci015 must have been failing with compile errors for
years, but we didn't notice because all output was ignored.

Therefore, replace all uses of ignore_output with either ignore_stderr
or ignore_stdout. In some cases I opted for adding the expected output.

Update submodule hpc and stm.

Reviewed by: simonmar

Differential Revision: https://phabricator.haskell.org/D2367

1 files changed, 0 insertions, 0 deletions

diff --git a/libraries/stm b/libraries/stm
-Subproject ee756000fc654a105ff3f8a319b904f2df33c65
+Subproject fe8899331e6ca7bdf80d57cf77dd597023ae471