[X86][SLM] +1uop for PSHUFBrm xmm

Extra 1uop for folded pshufb ops, based off a recent llvm-exegesis capture and what Intel AoM / Agner reports as well.

Author: RKSimon

llvm/lib/Target/X86/X86ScheduleSLM.td

@@ -385,8 +385,8 @@ defm : SLMWriteResPair<WriteShuffleY, [SLM_FPC_RSV0],  1>;
 defm : X86WriteResPairUnsupported<WriteShuffleZ>;
 defm : SLMWriteResPair<WriteShuffleX, [SLM_FPC_RSV0],  1>;
 defm : SLMWriteResPair<WriteVarShuffle,  [SLM_FPC_RSV0],  1>;
-defm : SLMWriteResPair<WriteVarShuffleX, [SLM_FPC_RSV0],  5, [5], 4>;
-defm : SLMWriteResPair<WriteVarShuffleY, [SLM_FPC_RSV0],  5, [5], 4>;
+defm : SLMWriteResPair<WriteVarShuffleX, [SLM_FPC_RSV0],  5, [5], 4, 1>;
+defm : X86WriteResPairUnsupported<WriteVarShuffleY>;
 defm : X86WriteResPairUnsupported<WriteVarShuffleZ>;
 defm : SLMWriteResPair<WriteBlend,  [SLM_FPC_RSV0],  1>;
 defm : SLMWriteResPair<WriteBlendY, [SLM_FPC_RSV0],  1>;

llvm/test/tools/llvm-mca/X86/SLM/resources-ssse3.s

@@ -157,7 +157,7 @@ psignw      (%rax), %xmm2
 # CHECK-NEXT:  1      1     1.00                        pshufb	%mm0, %mm2
 # CHECK-NEXT:  1      4     1.00    *                   pshufb	(%rax), %mm2
 # CHECK-NEXT:  4      5     5.00                        pshufb	%xmm0, %xmm2
-# CHECK-NEXT:  4      8     5.00    *                   pshufb	(%rax), %xmm2
+# CHECK-NEXT:  5      8     5.00    *                   pshufb	(%rax), %xmm2
 # CHECK-NEXT:  1      1     0.50                        psignb	%mm0, %mm2
 # CHECK-NEXT:  1      4     1.00    *                   psignb	(%rax), %mm2
 # CHECK-NEXT:  1      1     0.50                        psignb	%xmm0, %xmm2