[llvm] Revert "[X86] Add TuningSlowPDEP/PEXT flags and control vector PDEP/PEXT scalarization with them" (PR #219210)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/X86/X86ISelLowering.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 82ae1621a..0df330593 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -1775,7 +1775,7 @@ X86TargetLowering::X86TargetLowering(const X86TargetMachine &TM,
 
       for (auto VT : { MVT::v4i32, MVT::v8i32, MVT::v2i64, MVT::v4i64,
                        MVT::v4f32, MVT::v8f32, MVT::v2f64, MVT::v4f64 })
-        setOperationAction(ISD::MGATHER,  VT, Custom);
+        setOperationAction(ISD::MGATHER, VT, Custom);
     }
 
     if (Subtarget.hasGFNI()) {

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https://github.com/llvm/llvm-project/pull/219210