[mono] Reenable some amd64 intrinsic tests, enable amd64 ISA extensions when AOTing, several intrinsics fixes

[imhameed]

Changes:

• Consolidate SSE shuffle constant unrolling

  Remove OP_SSE2_SHUFFLE, which is unused.

  Rename OP_SSE_SHUFFLE to OP_SSE_SHUFPS, to make this more consistent with
  the naming convention used for other SSE shuffles.

  Use immediate_unroll_* instead of hand-writing branch emission. These
  branch tables are huge (in the simplest case, with 256 different constant
  values, we can spend over 1KB of code on nothing but shufps and jmps, and
  the cost gets worse if any tail duplication happens), and are currently
  emitted inline. Future work ought to:

  1. use a sequence of extractelement/insertelement instructions, which can be
     optimized into a constant shuffle when the shuffle control parameter is
     constant, and otherwise generates a high-latency but low-code-size fallback
     (note that this only works for shuffles); or

  2. emit the fallback branch tables out of line and use llvm.is.constant to
     generate either a constant shuffle or a call to a fallback shuffle branch
     table function (the cost isn't too bad: a direct-call/ret pair would add ~4-5
     cycles and eat an RSB slot on top of the cost of the branch table).

  Fixes JIT/HardwareIntrinsics/X86/Regression/GitHub_21855/GitHub_21855_r.

• Fix intrinsification for MathF.Round

  OP_SSE41_ROUNDS takes two source registers, not one.

  TODO: Investigate what happens with llvm.round and
  llvm.experimental.constrained.round.

  Fixes JIT/Intrinsics/MathRoundSingle_r,
  JIT/Math/Functions/Functions_r, and
  JIT/Performance/CodeQuality/Math/Functions/Functions.

• Clean up intrinsic group lookup

  Use a dummy never-supported intrinsic group as a default fallback, instead of
  adding a special-case "intrinsic group not present" branch

  Correctly intrinsify get_IsSupported even when not using LLVM

  Fixes spurious System.PlatformNotSupportedExceptions when calling
  get_IsSupported when the LLVM backend isn't being used.

• The "not" SSE comparions are unordered, so use the appropriate unordered LLVM
  IR comparisons

  Add labeled constants for the immediate parameter we pass to CMPSS/CMPSD.

  Fixes Regressions.coreclr/GitHub_34094/Test34094.

• Fix LoadAndDuplicateToVector128

  LoadAndDuplicateToVector128 should load exactly one 8-byte value from memory
  before broadcasting it into both lanes in a 128-bit result vector.

  Fixes JIT/HardwareIntrinsics/X86/Sse3/LoadAndDuplicateToVector128_r.

• Implement constant unrolling for Sse41.DotProduct

  As with shuffles, the fallback jump table should probably be kept out of line
  someday; vdpps uses 6 bytes of space, so any fallback jump table for the
  selection control mask will be at least 1.5kb large.

  Fixes JIT/HardwareIntrinsics/X86/Sse41/DotProduct_r.

• Implement constant unrolling for Sse41.Blend

  The usual: big jump blobs should be out of line, possible to use
  extract/insertelement.

• Zero is part of the domain of lzcnt and shouldn't yield an undef.

  Use fully-defined llvm.ctlz when implementing OP_LZCNT32/64.

  Fixes JIT/HardwareIntrinsics/X86/Regression/GitHub_21666/GitHub_21666_r

• Unify amd64/arm64 vector extraction handling

  Removes OP_EXTRACT_U1 and OP_EXTRACT_U2. Instead, sign/zero extension is
  determined via inst_c1 for OP_EXTRACT_* and OP_XEXTRACT_* (and
  OP_EXTRACTX_U2, which doesn't seem to be generated as part of intrinsic
  translation), which must be set to a MonoTypeEnum.

  Replaces OP_EXTRACT_VAR_* with OP_XEXTRACT_*.

  Fixes JIT/Regression/JitBlue/GitHub_23159/GitHub_23159 and
  JIT/Regression/JitBlue/GitHub_13568/GitHub_13568.

• Remove OP_DPPS; it is unused

• Disable JIT/Regression/CLR-x86-JIT/V1.1-M1-Beta1/b143840 when running with mono LLVM AOT

• Disable finalizearray when running with mono LLVM AOT

• Disable Vector256_1/Vector128_1 tests on wasm

• Enable sse4.2, popcnt, lzcnt, bmi, and bmi2 when AOT compiling the runtime
  tests.

• Pass the runtime variant to helixpublishwitharcade.proj, and forward this
  runtime variant to testenvironment.proj.

  This is used to selectively enable LLVM JIT on the LLVM AOT lanes. Removes
  the hack added to CLRTest.Execute.Bash.targets that did this for arm64 (which
  happens to only have an LLVM AOT lane for runtime tests right now).

• Enable JIT/HardwareIntrinsics/General/Vector128_1/**,
  JIT/HardwareIntrinsics/General/Vector256/**,
  JIT/HardwareIntrinsics/General/Vector256_1/**, and
  JIT/HardwareIntrinsics/X86/General/IsSupported*/** for LLVM AOT on amd64.

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Issue Details

---

Author:	imhameed
Assignees:	-
Labels:	area-Infrastructure-mono, runtime-mono
Milestone:	-

[fanyang-mono]

@imhameed If you rebase this PR to get b13715b, you should be able to get all the logs generated by runtime tests, which could help you investigate these test failures.