[Constants] don't die processing non-ConstantInt GEP indices in isGEPWithNoNotionalOverIndexing() (PR31262)

This should fix:
https://llvm.org/bugs/show_bug.cgi?id=31262

llvm-svn: 289401
diff --git a/llvm/test/Transforms/InstSimplify/compare.ll b/llvm/test/Transforms/InstSimplify/compare.ll
index e5aea26..cd2fa88 100644
--- a/llvm/test/Transforms/InstSimplify/compare.ll
+++ b/llvm/test/Transforms/InstSimplify/compare.ll
@@ -65,6 +65,17 @@
 ; CHECK-NEXT: ret i1 false
 }
 
+@a = common global [1 x i32] zeroinitializer, align 4
+
+define i1 @PR31262() {
+; CHECK-LABEL: @PR31262(
+; CHECK-NEXT:    ret i1 icmp uge (i32* getelementptr ([1 x i32], [1 x i32]* @a, i64 0, i64 undef), i32* getelementptr inbounds ([1 x i32], [1 x i32]* @a, i32 0, i32 0))
+;
+  %idx = getelementptr inbounds [1 x i32], [1 x i32]* @a, i64 0, i64 undef
+  %cmp = icmp uge i32* %idx, getelementptr inbounds ([1 x i32], [1 x i32]* @a, i32 0, i32 0)
+  ret i1 %cmp
+}
+
 define i1 @gep5() {
 ; CHECK-LABEL: @gep5(
   %x = alloca %gept, align 8