[NFC][InstSimplify] add test cases with base results for or-xor fold

[MehrHeidar]

Summary

This patch adds tests with baseline results as a pre-commit for D113861

[Asif]

LGTM

llvm/test/Transforms/InstSimplify/or.ll

;
   %i = xor i32 %B, -1
   %i2 = and i32 %A, %i
   %i3 = or i32 %B, %A
   %i4 = xor i32 %i3, -1
   %i5 = or i32 %i4, %i2
   ret i32 %i5
 }
 
+; (A | B) | (A ^ B) --> A | B
+
+define i69 @or_or_xor(i69 %A, i69 %B) {
+; CHECK-LABEL: @or_or_xor(
+; CHECK-NEXT:    [[I1:%.*]] = or i69 [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[I2:%.*]] = xor i69 [[A]], [[B]]
+; CHECK-NEXT:    [[I3:%.*]] = or i69 [[I1]], [[I2]]
+; CHECK-NEXT:    ret i69 [[I3]]
+;
+  %i1 = or i69 %A, %B
+  %i2 = xor i69 %A, %B
+  %i3 = or i69 %i1, %i2
+  ret i69 %i3
+}
+
+define <4 x i4> @or_or_xor_commuted(<4 x i4> %A, <4 x i4> %B) {
+; CHECK-LABEL: @or_or_xor_commuted(
+; CHECK-NEXT:    [[I1:%.*]] = or <4 x i4> [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[I2:%.*]] = xor <4 x i4> [[A]], [[B]]
+; CHECK-NEXT:    [[I3:%.*]] = or <4 x i4> [[I2]], [[I1]]
+; CHECK-NEXT:    ret <4 x i4> [[I3]]
+;
+  %i1 = or <4 x i4> %A, %B
+  %i2 = xor <4 x i4> %A, %B
+  %i3 = or <4 x i4> %i2, %i1
+  ret <4 x i4> %i3
+}
+
 define i32 @shifted_all_ones(i32 %shamt) {
 ; CHECK-LABEL: @shifted_all_ones(
 ; CHECK-NEXT:    ret i32 -1
 ;
   %r = lshr i32 -1, %shamt
   %s = sub i32 32, %shamt
   %l = shl i32 -1, %s
   %o = or i32 %r, %l