[llvm] [X86][APX] Implement push+push2+push pre-alignment strategy for PP2 (PR #205031)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/X86/X86FrameLowering.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Target/X86/X86FrameLowering.cpp b/llvm/lib/Target/X86/X86FrameLowering.cpp
index b703fc24b..798d9768c 100644
--- a/llvm/lib/Target/X86/X86FrameLowering.cpp
+++ b/llvm/lib/Target/X86/X86FrameLowering.cpp
@@ -395,11 +395,10 @@ MachineInstrBuilder X86FrameLowering::BuildStackAdjustment(
   } else {
     bool IsSub = Offset < 0;
     uint64_t AbsOffset = IsSub ? -Offset : Offset;
-    const unsigned Opc =
-        IsSub ? (UseNF ? (unsigned)X86::SUB64ri32_NF
-                       : getSUBriOpcode(Uses64BitFramePtr))
-              : (UseNF ? (unsigned)X86::ADD64ri32_NF
-                       : getADDriOpcode(Uses64BitFramePtr));
+    const unsigned Opc = IsSub ? (UseNF ? (unsigned)X86::SUB64ri32_NF
+                                        : getSUBriOpcode(Uses64BitFramePtr))
+                               : (UseNF ? (unsigned)X86::ADD64ri32_NF
+                                        : getADDriOpcode(Uses64BitFramePtr));
     MI = BuildMI(MBB, MBBI, DL, TII.get(Opc), StackPtr)
              .addReg(StackPtr)
              .addImm(AbsOffset);
@@ -2787,9 +2786,8 @@ void X86FrameLowering::emitEpilogue(MachineFunction &MF,
                  PI->getOperand(0).getReg() == StackPtr &&
                  (Opc == X86::ADD64ri32 || Opc == X86::ADD64ri32_NF ||
                   Opc == X86::ADD32ri || Opc == X86::LEA64r)) {
-        int64_t SPAdj = Opc == X86::LEA64r
-                            ? PI->getOperand(4).getImm()
-                            : PI->getOperand(2).getImm();
+        int64_t SPAdj = Opc == X86::LEA64r ? PI->getOperand(4).getImm()
+                                           : PI->getOperand(2).getImm();
         Offset += SPAdj;
         BuildCFI(MBB, MBBI, DL,
                  MCCFIInstruction::cfiDefCfaOffset(nullptr, -Offset),

``````````

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https://github.com/llvm/llvm-project/pull/205031