Changes

[LLDB] Skip TestGuiBasicDebug.py on Arm and AArch64/Linux

TestGuiBasicDebug.py is intermittenly timing out on LLDB AArch64/Linux
buildbot. Putting SkipIf decorator untill root cuase is identified.

[clang][AArch64][SVE] Avoid going through memory for VLAT <-> VLST casts

This change makes use of the llvm.vector.extract intrinsic to avoid
going through memory when performing bitcasts between vector-length
agnostic types and vector-length specific types.

Depends on D91362

Reviewed By: c-rhodes

Differential Revision: https://reviews.llvm.org/D92761

[CostModel]Replace FixedVectorType by VectorType in costgetIntrinsicInstrCost

This patch replaces FixedVectorType by VectorType in getIntrinsicInstrCost
in BasicTTIImpl.h. It re-arranges the scalable type test earlier return
and add tests for scalable types.

Depends on D91532

Differential Revision: https://reviews.llvm.org/D92094

[CostModel]Migrate getTreeCost() to use InstructionCost

This patch changes the type of cost variables (for instance: Cost, ExtractCost,
SpillCost) to use InstructionCost.
This patch also changes the type of cost variables to InstructionCost in other
functions that use the result of getTreeCost()
This patch is part of a series of patches to use InstructionCost instead of
unsigned/int for the cost model functions.

See this thread for context:
http://lists.llvm.org/pipermail/llvm-dev/2020-November/146408.html

Depends on D91174

Differential Revision: https://reviews.llvm.org/D93049

[mlir][spirv] Add parsing and printing support for SpecConstantOperation

Adds more support for `SpecConstantOperation` by defining a custom
syntax for the op and implementing its parsing and printing.

Reviewed By: mravishankar, antiagainst

Differential Revision: https://reviews.llvm.org/D92919

[CostModel] Add costs for llvm.experimental.vector.{extract,insert} intrinsics

Adds cost model support for the new llvm.experimental.vector.{extract,insert}
intrinsics, using the existing getExtractSubvectorOverhead and
getInsertSubvectorOverhead functions for shuffles.

Previously this case would throw an assertion.

Differential Revision: https://reviews.llvm.org/D93043

[PATCH] [compiler-rt] [builtins] Fix name of __aarch64_have_lse_atomics on Darwin

...where the name of that variable defined in
compiler-rt/lib/builtins/cpu_model.c is decorated with a leading underscore

Differential Revision: https://reviews.llvm.org/D93390

[Statepoints] Extract invoke tests into separate file. NFC.

Extract VReg lowering tests with invokes into separate file
for easier maintenance/modification.
Check MIR after register allocation - at this point all
transformations we're interested in has been applied and verifying
of MIR is simpler than that of assembly.

[SLPVectorizer]Migrate getEntryCost to return InstructionCost

This patch also changes:
  the return type of getGatherCost and
  the signature of the debug function dumpTreeCosts
to use InstructionCost.

This patch is part of a series of patches to use InstructionCost instead of
unsigned/int for the cost model functions.

See this thread for context:
http://lists.llvm.org/pipermail/llvm-dev/2020-November/146408.html

See this patch for the introduction of the type:
https://reviews.llvm.org/D91174

Depends on D93049

Differential Revision: https://reviews.llvm.org/D93127