Successfully identified regression in *llvm* in CI configuration 
tcwg_bmk_llvm_tk1/llvm-release-arm-spec2k6-O2_LTO.  So far, this commit has 
regressed CI configurations:
 - tcwg_bmk_llvm_tk1/llvm-release-arm-spec2k6-O2_LTO

Culprit:
<cut>
commit d8c373815d35df1b8544784ce172ade68fb01f8f
Author: Vladislav Vinogradov <vlad.vinogra...@intel.com>
Date:   Tue Feb 2 18:26:05 2021 +0000

    [mlir][NFC] Add missing include guards to MlirOptMain.h
    
    Reviewed By: mehdi_amini
    
    Differential Revision: https://reviews.llvm.org/D95533
</cut>

Results regressed to (for first_bad == d8c373815d35df1b8544784ce172ade68fb01f8f)
# reset_artifacts:
-10
# build_abe binutils:
-9
# build_abe stage1 -- --set gcc_override_configure=--with-mode=arm --set 
gcc_override_configure=--disable-libsanitizer:
-8
# build_abe linux:
-7
# build_abe glibc:
-6
# build_abe stage2 -- --set gcc_override_configure=--with-mode=arm --set 
gcc_override_configure=--disable-libsanitizer:
-5
# build_llvm true:
-3
# true:
0
# benchmark -- -O2_LTO_marm 
artifacts/build-d8c373815d35df1b8544784ce172ade68fb01f8f/results_id:
1
# 464.h264ref,libc.so.6                                         regressed by 120

from (for last_good == f1bdf9fa9bc5edc616842b6cb9028b7d207e012c)
# reset_artifacts:
-10
# build_abe binutils:
-9
# build_abe stage1 -- --set gcc_override_configure=--with-mode=arm --set 
gcc_override_configure=--disable-libsanitizer:
-8
# build_abe linux:
-7
# build_abe glibc:
-6
# build_abe stage2 -- --set gcc_override_configure=--with-mode=arm --set 
gcc_override_configure=--disable-libsanitizer:
-5
# build_llvm true:
-3
# true:
0
# benchmark -- -O2_LTO_marm 
artifacts/build-f1bdf9fa9bc5edc616842b6cb9028b7d207e012c/results_id:
1

Artifacts of last_good build: 
https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tk1-llvm-release-arm-spec2k6-O2_LTO/9/artifact/artifacts/build-f1bdf9fa9bc5edc616842b6cb9028b7d207e012c/
Results ID of last_good: 
tk1_32/tcwg_bmk_llvm_tk1/bisect-llvm-release-arm-spec2k6-O2_LTO/3730
Artifacts of first_bad build: 
https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tk1-llvm-release-arm-spec2k6-O2_LTO/9/artifact/artifacts/build-d8c373815d35df1b8544784ce172ade68fb01f8f/
Results ID of first_bad: 
tk1_32/tcwg_bmk_llvm_tk1/bisect-llvm-release-arm-spec2k6-O2_LTO/3737
Build top page/logs: 
https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tk1-llvm-release-arm-spec2k6-O2_LTO/9/

Configuration details:


Reproduce builds:
<cut>
mkdir investigate-llvm-d8c373815d35df1b8544784ce172ade68fb01f8f
cd investigate-llvm-d8c373815d35df1b8544784ce172ade68fb01f8f

git clone https://git.linaro.org/toolchain/jenkins-scripts

mkdir -p artifacts/manifests
curl -o artifacts/manifests/build-baseline.sh 
https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tk1-llvm-release-arm-spec2k6-O2_LTO/9/artifact/artifacts/manifests/build-baseline.sh
 --fail
curl -o artifacts/manifests/build-parameters.sh 
https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tk1-llvm-release-arm-spec2k6-O2_LTO/9/artifact/artifacts/manifests/build-parameters.sh
 --fail
curl -o artifacts/test.sh 
https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tk1-llvm-release-arm-spec2k6-O2_LTO/9/artifact/artifacts/test.sh
 --fail
chmod +x artifacts/test.sh

# Reproduce the baseline build (build all pre-requisites)
./jenkins-scripts/tcwg_bmk-build.sh @@ artifacts/manifests/build-baseline.sh

# Save baseline build state (which is then restored in artifacts/test.sh)
mkdir -p ./bisect
rsync -a --del --delete-excluded --exclude /bisect/ --exclude /artifacts/ 
--exclude /llvm/ ./ ./bisect/baseline/

cd llvm

# Reproduce first_bad build
git checkout --detach d8c373815d35df1b8544784ce172ade68fb01f8f
../artifacts/test.sh

# Reproduce last_good build
git checkout --detach f1bdf9fa9bc5edc616842b6cb9028b7d207e012c
../artifacts/test.sh

cd ..
</cut>

History of pending regressions and results: 
https://git.linaro.org/toolchain/ci/base-artifacts.git/log/?h=linaro-local/ci/tcwg_bmk_llvm_tk1/llvm-release-arm-spec2k6-O2_LTO

Artifacts: 
https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tk1-llvm-release-arm-spec2k6-O2_LTO/9/artifact/artifacts/
Build log: 
https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tk1-llvm-release-arm-spec2k6-O2_LTO/9/consoleText

Full commit (up to 1000 lines):
<cut>
commit d8c373815d35df1b8544784ce172ade68fb01f8f
Author: Vladislav Vinogradov <vlad.vinogra...@intel.com>
Date:   Tue Feb 2 18:26:05 2021 +0000

    [mlir][NFC] Add missing include guards to MlirOptMain.h
    
    Reviewed By: mehdi_amini
    
    Differential Revision: https://reviews.llvm.org/D95533
---
 mlir/include/mlir/Support/MlirOptMain.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mlir/include/mlir/Support/MlirOptMain.h 
b/mlir/include/mlir/Support/MlirOptMain.h
index da03baed2ae7..71d47317571e 100644
--- a/mlir/include/mlir/Support/MlirOptMain.h
+++ b/mlir/include/mlir/Support/MlirOptMain.h
@@ -10,6 +10,9 @@
 //
 
//===----------------------------------------------------------------------===//
 
+#ifndef MLIR_SUPPORT_MLIROPTMAIN_H
+#define MLIR_SUPPORT_MLIROPTMAIN_H
+
 #include "mlir/Support/LogicalResult.h"
 #include "llvm/ADT/StringRef.h"
 
@@ -59,3 +62,5 @@ LogicalResult MlirOptMain(int argc, char **argv, 
llvm::StringRef toolName,
                           bool preloadDialectsInContext = true);
 
 } // end namespace mlir
+
+#endif // MLIR_SUPPORT_MLIROPTMAIN_H
</cut>
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