llvm-project

76111306 - [AMDGPU] Code clean up and denorm check removal for bf16 omod folding (#219042)

[AMDGPU] Code clean up and denorm check removal for bf16 omod folding (#219042) This is the follow-up PR to address the additional comments and suggestions from https://github.com/llvm/llvm-project/pull/218286 Use FP64FP16Denormals to check the output denomal flushing because BF16 is usig the default. Also clean up the surrounding code: - src0_modifiers/src1_modifiers are always present on these packed opcodes (VOP3P_Profile sets HasModifiers), so drop the null checks and dereference the operands directly. - Fix the comment on the modifier check: rather than "modifiers other than op_sel_hi block folding", the point is that when omod is applied to a packed instruction it only applies to the low half of the input and output. - In tryFoldOMod(), drop the redundant isReg()/isImm() checks when looking through a REG_SEQUENCE; a 5-operand REG_SEQUENCE always has that operand shape.