[OpenMP] Update the default version of OpenMP to 5.1

The default version of OpenMP is updated from 5.0 to 5.1 which means if -fopenmp is specified but -fopenmp-version is not specified with clang, t

[OpenMP] Update the default version of OpenMP to 5.1

The default version of OpenMP is updated from 5.0 to 5.1 which means if -fopenmp is specified but -fopenmp-version is not specified with clang, the default version of OpenMP is taken to be 5.1. After modifying the Frontend for that, various LIT tests were updated. This patch contains all such changes. At a high level, these are the patterns of changes observed in LIT tests -

# RUN lines which mentioned `-fopenmp-version=50` need to kept only if the IR for version 5.0 and 5.1 are different. Otherwise only one RUN line with no version info(i.e. default version) needs to be there.

# Test cases of this sort already had the RUN lines with respect to the older default version 5.0 and the version 5.1. Only swapping the version specification flag `-fopenmp-version` from newer version RUN line to older version RUN line is required.

# Diagnostics: Remove the 5.0 version specific RUN lines if there was no difference in the Diagnostics messages with respect to the default 5.1.

# Diagnostics: In case there was any difference in diagnostics messages between 5.0 and 5.1, mention version specific messages in tests.

# If the test contained version specific ifdef's e.g. "#ifdef OMP5" but there were no RUN lines for any other version than 5.X, then bring the code guarded by ifdef's outside and remove the ifdef's.

# Some tests had RUN lines for both 5.0 and 5.1 versions, but it is found that the IR for 5.0 is not different from the 5.1, therefore such RUN lines are redundant. So, such duplicated lines are removed.

# To generate CHECK lines automatically, use the script llvm/utils/update_cc_test_checks.py

Reviewed By: saiislam, ABataev

Differential Revision: https://reviews.llvm.org/D129635

(cherry picked from commit 9dd2999907dc791136a75238a6000f69bf67cf4e)

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[OpenMP] Convert tests to opaque pointers (NFC)

Conversion performed using the script at:
https://gist.github.com/nikic/98357b71fd67756b0f064c9517b62a34

These are only tests where no manual fixup w

[OpenMP] Convert tests to opaque pointers (NFC)

Conversion performed using the script at:
https://gist.github.com/nikic/98357b71fd67756b0f064c9517b62a34

These are only tests where no manual fixup was required.

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[OpaquePtrs][Clang] Add -no-opaque-pointers to tests (NFC)

This adds -no-opaque-pointers to clang tests whose output will
change when opaque pointers are enabled by default. This is
intended to be p

[OpaquePtrs][Clang] Add -no-opaque-pointers to tests (NFC)

This adds -no-opaque-pointers to clang tests whose output will
change when opaque pointers are enabled by default. This is
intended to be part of the migration approach described in
https://discourse.llvm.org/t/enabling-opaque-pointers-by-default/61322/9.

The patch has been produced by replacing %clang_cc1 with
%clang_cc1 -no-opaque-pointers for tests that fail with opaque
pointers enabled. Worth noting that this doesn't cover all tests,
there's a remaining ~40 tests not using %clang_cc1 that will need
a followup change.

Differential Revision: https://reviews.llvm.org/D123115

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Reapply "[OpenMP][NFCI] Embed the source location string size in the ident_t"

This reverts commit 73ece231ee0cf048d56841f47915beb1db6afc26 and
reapplies 7bfcdbcbf368cea14a5236080af975d5878a46eb with

Reapply "[OpenMP][NFCI] Embed the source location string size in the ident_t"

This reverts commit 73ece231ee0cf048d56841f47915beb1db6afc26 and
reapplies 7bfcdbcbf368cea14a5236080af975d5878a46eb with mlir changes.
Also reverts commit 423ba12971bac8397c87fcf975ba6a4b7530ed28 and
includes the unit test changes of
16da2140045808b2aea1d28366ca7d326eb3c809.

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Revert "[OpenMP][NFCI] Embed the source location string size in the ident_t"

This reverts commit 7bfcdbcbf368cea14a5236080af975d5878a46eb.
Broke MLIR build

[OpenMP][NFCI] Embed the source location string size in the ident_t

One of the unused ident_t fields now holds the size of the string
(=const char *) field so we have an easier time dealing with tho

[OpenMP][NFCI] Embed the source location string size in the ident_t

One of the unused ident_t fields now holds the size of the string
(=const char *) field so we have an easier time dealing with those
in the future.

Differential Revision: https://reviews.llvm.org/D113126

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[OpenMP51] Accept `primary` as proc bind affinity policy in Clang

Reviewed By: ABataev

Differential Revision: https://reviews.llvm.org/D99622