compiler_wrapper: add -fexperimental-new-pass-manager

LLVM is currently build with DENABLE_EXPERIMENTAL_NEW_PASS_MANAGER=ON on
Chrome OS. This is however not reflected in clang crash diagnoses.
Adding -fexperimental-new-pass-manager to help with reproducibility on
4c.

BUG=chromium:1111103

TEST=CQ tests.

Change-Id: Ie01431dff397e982469e29c9132e21374354762d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/2327414
Reviewed-by: George Burgess <gbiv@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Jian Cai <jiancai@google.com>
40 files changed