[llvm] [AMDGPU] Improve isBasicBlockPrologue to only add necessary instructions (PR #113303)

[Matt Arsenault via llvm-commits]

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@@ -8917,8 +8933,7 @@ bool SIInstrInfo::isBasicBlockPrologue(const MachineInstr &MI,
 
   uint16_t Opcode = MI.getOpcode();
   return IsNullOrVectorRegister &&
-         (isSGPRSpill(Opcode) || isWWMRegSpillOpcode(Opcode) ||
-          Opcode == AMDGPU::IMPLICIT_DEF ||
+         (isPrologueOperandReload(MI) || Opcode == AMDGPU::IMPLICIT_DEF ||
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arsenm wrote:

Defer this check as it's the most complex 

https://github.com/llvm/llvm-project/pull/113303