[llvm] [AArch64][SVE2p1] Remove redundant PTESTs when predicate is a WHILEcc_x2 (PR #156478)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/AArch64/AArch64ISelLowering.cpp llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
index ad20e1a23..7e9d3e6ec 100644
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -20100,21 +20100,21 @@ static bool isPredicateCCSettingOp(SDValue N) {
       (N.getOpcode() == ISD::GET_ACTIVE_LANE_MASK) ||
       (N.getOpcode() == ISD::INTRINSIC_WO_CHAIN &&
        (N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilege ||
-       (N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilege_x2 ||
-        N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilegt ||
-        N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilegt_x2 ||
-        N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilehi ||
-        N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilehi_x2 ||
-        N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilehs ||
-        N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilehs_x2 ||
-        N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilele ||
-        N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilele_x2 ||
-        N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilelo ||
-        N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilelo_x2 ||
-        N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilels ||
-        N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilels_x2 ||
-        N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilelt ||
-        N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilelt_x2))))
+        (N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilege_x2 ||
+         N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilegt ||
+         N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilegt_x2 ||
+         N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilehi ||
+         N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilehi_x2 ||
+         N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilehs ||
+         N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilehs_x2 ||
+         N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilele ||
+         N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilele_x2 ||
+         N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilelo ||
+         N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilelo_x2 ||
+         N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilels ||
+         N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilels_x2 ||
+         N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilelt ||
+         N.getConstantOperandVal(0) == Intrinsic::aarch64_sve_whilelt_x2))))
     return true;
 
   return false;

``````````

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https://github.com/llvm/llvm-project/pull/156478