[InstCombine] Add pre-commit tests. NFC.

Author: dtcxzyw

llvm/test/Transforms/InstCombine/select-gep.ll

@@ -286,3 +286,29 @@ define <2 x ptr> @test7(<2 x ptr> %p1, i64 %idx, <2 x i1> %cc) {
   %select = select <2 x i1> %cc, <2 x ptr> %p1, <2 x ptr> %gep
   ret <2 x ptr> %select
 }
+
+define ptr @ptr_eq_replace_freeze1(ptr %p, ptr %q) {
+; CHECK-LABEL: @ptr_eq_replace_freeze1(
+; CHECK-NEXT:    [[Q_FR:%.*]] = freeze ptr [[Q:%.*]]
+; CHECK-NEXT:    ret ptr [[Q_FR]]
+;
+  %p.fr = freeze ptr %p
+  %q.fr = freeze ptr %q
+  %cmp = icmp eq ptr %p.fr, %q.fr
+  %select = select i1 %cmp, ptr %p.fr, ptr %q.fr
+  ret ptr %select
+}
+
+define ptr @ptr_eq_replace_freeze2(ptr %p, ptr %q) {
+; CHECK-LABEL: @ptr_eq_replace_freeze2(
+; CHECK-NEXT:    [[P_FR:%.*]] = freeze ptr [[P:%.*]]
+; CHECK-NEXT:    [[SELECT:%.*]] = getelementptr i8, ptr [[P_FR]], i64 16
+; CHECK-NEXT:    ret ptr [[SELECT]]
+;
+  %gep1 = getelementptr i32, ptr %p, i64 4
+  %gep2 = getelementptr i32, ptr %q, i64 4
+  %cmp = icmp eq ptr %p, %q
+  %cmp.fr = freeze i1 %cmp
+  %select = select i1 %cmp.fr, ptr %gep1, ptr %gep2
+  ret ptr %select
+}