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[PowerPC] Further refactor atomic loads

Depending on the availability of the word-part feature, different code
is generated for 1 and 2 byte atomic loads. This change moves the decision
to use the word-part feature from C++ into TableGen patterns. This is done
via:

 - move code from `EmitPartwordAtomicBinary()` into new function
   'signExtendOperandIfUnknown()'
 - decouple functions `EmitPartwordAtomicBinary()` and `EmitAtomicBinary()`
 - remove the size from the name of the pseudo instructions; instead,
   introduce a pseudo instruction which is used in case the word-part
   feature is missing
 - update the handling of the pseudo instruction insertion accordingly

A side effect of this change is the implementation requires 11 pseudo
instructions less.

remove experimental/unnecessary forward decl

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rebase

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[𝘀𝗽𝗿] changes introduced through rebase

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[𝘀𝗽𝗿] changes introduced through rebase

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rebase

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[𝘀𝗽𝗿] changes introduced through rebase

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rebase and reformat

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[𝘀𝗽𝗿] changes introduced through rebase

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rebase

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[𝘀𝗽𝗿] changes introduced through rebase

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rebase and reformat, and add proper error and a new test for taskwait without depends inside taskgraph

Created using spr 1.3.5

[𝘀𝗽𝗿] changes introduced through rebase

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rebase and reformat

Created using spr 1.3.5

[𝘀𝗽𝗿] changes introduced through rebase

Created using spr 1.3.5

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rebase

Created using spr 1.3.5

[𝘀𝗽𝗿] changes introduced through rebase

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rebase and reformat

Created using spr 1.3.5

[𝘀𝗽𝗿] changes introduced through rebase

Created using spr 1.3.5

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rebase and reformat

Created using spr 1.3.5

[𝘀𝗽𝗿] changes introduced through rebase

Created using spr 1.3.5

[skip ci]

rebase and reformat

Created using spr 1.3.5

[𝘀𝗽𝗿] changes introduced through rebase

Created using spr 1.3.5

[skip ci]

rebase

Created using spr 1.3.5

[𝘀𝗽𝗿] changes introduced through rebase

Created using spr 1.3.5

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[clang-tidy][readability-identifier-length] add structured bindings support (#193838)

This change extends the `readability-identifier-length` check to structured
binding declarations. Currently, only the names of regular variables,
function parameters, exceptions variables in catch blocks and loop
variables are checked. In other words, `int a = ...` warns but `auto [a]
= ...` does not.

This change enables the check to warn when the length of the names
introduced in structured bindings declarations is too short, following
the same rules as for the other kinds of declarations. Two new options
are introduced:
- `MinimumBindingNameLength` defines the number of characters below
which a warning is issued (the default it set to 2, like for loop
variables and exceptions variables)
- `IgnoredBindingNames` defines the names for which warnings should not
issued (by default, `_` is the only allowed exception)

To implement this feature, a new matcher is registered which matches all

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[WebAssembly] Add getMinVectorRegisterBitWidth overriding (#189465)