Remove dead pattern match - this work is done in the combiner

Author: chrisjbris

llvm/lib/Target/AMDGPU/SIInstructions.td

@@ -2391,11 +2391,6 @@ def : GCNPat<(i32 (trunc (srl i64:$src0, (i32 ShiftAmt32Imm:$src1)))),
 
 let True16Predicate = UseRealTrue16Insts in {
 
-// Prevents regression in fneg-modifier-casting.ll along with modifications to XorCombine() when v2i32 or is legal.
-def : AMDGPUPat <
-  (fneg (select i1:$src0, (f32 (bitconvert i32:$src1)), (f32 (bitconvert i32:$src2)))),
-    (V_CNDMASK_B32_e64 (i32 1), $src2, (i32 1), $src1, $src0)>;
-
 def : GCNPat <
   (rotr i32:$src0, i32:$src1),
   (V_ALIGNBIT_B32_t16_e64 /* src0_modifiers */ 0, $src0,