We can use *Set::insert_range to collapse:

  for (auto Elem : Range)
    Set.insert(E);

down to:

  Set.insert_range(Range);

In some cases, we can further fold that into the set declaration.

All inside LLVM_DEBUG, some of which have been cleaned up by adding block
scopes to allow them to format more nicely.

Identified with misc-include-cleaner.

Fixes #82659

There are some functions, such as `findRegisterDefOperandIdx` and  `findRegisterDefOperand`, that have too many default parameters. As a result, we have encountered some issues due to the lack of TRI  parameters, as shown in issue #82411.

Following @RKSimon 's suggestion, this patch refactors 9 functions, including `{reads, kills, defines, modifies}Register`,  `registerDefIsDead`, and `findRegister{UseOperandIdx, UseOperand, DefOperandIdx, DefOperand}`, adjusting the order of the TRI parameter and making it required. In addition, all the places that call these functions have also been updated correctly to ensure no additional impact.

After this, the caller of these functions should explicitly know whether to pass the `TargetRegisterInfo` or just a `nullptr`.

Differential Revision: https://reviews.llvm.org/D148613

Differential Revision: https://reviews.llvm.org/D125391

AArch32/Armv8A  introduced the performance deprecation of certain patterns
of IT instructions.  After some debate internal to ARM, this is now being
reverted; i.e. no IT instruction patterns are performance deprecated
anymore, as the perfomance degredation is not significant enough.

This reverts the following:

"ARMv8-A deprecates some uses of the T32 IT instruction. All uses of
IT that apply to instructions other than a single subsequent 16-bit
instruction from a restricted set are deprecated, as are explicit
references to the PC within that single 16-bit instruction. This permits
the non-deprecated forms of IT and subsequent instructions to be treated
as a single 32-bit conditional instruction."

The deprecation no longer applies, but the behaviour may be controlled
by the -arm-restrict-it and -arm-no-restrict-it command-line options,
with the latter being the default. No warnings about complex IT blocks
will be generated.

Reviewed By: dmgreen

Differential Revision: https://reviews.llvm.org/D118044

This just pulls the MVEVPTBlockPass into a separate file, as opposed to being
wrapped up in Thumb2ITBlockPass.

Differential revision: https://reviews.llvm.org/D66579

llvm-svn: 370187