[mlir] [Test] Moved & renamed test case

Author: Luohaothu

mlir/test/Conversion/MemRefToLLVM/invalid.mlir

@@ -2,6 +2,13 @@
 // Since the error is at an unknown location, we use FileCheck instead of
 // -veri-y-diagnostics here
 
+// CHECK: redefinition of reserved function 'malloc' of different type '!llvm.func<void (i64)>' is prohibited
+llvm.func @malloc(i64)
+func.func @redef_reserved() {
+    %alloc = memref.alloc() : memref<1024x64xf32, 1>
+    llvm.return
+}
+
 // CHECK: conversion of memref memory space "foo" to integer address space failed. Consider adding memory space conversions.
 // CHECK-LABEL: @bad_address_space
 func.func @bad_address_space(%a: memref<2xindex, "foo">) {