Update for llvm change. NFC.

llvm-svn: 258080
diff --git a/lldb/source/Expression/IRMemoryMap.cpp b/lldb/source/Expression/IRMemoryMap.cpp
index e96bddd..3dbdc5a 100644
--- a/lldb/source/Expression/IRMemoryMap.cpp
+++ b/lldb/source/Expression/IRMemoryMap.cpp
@@ -77,7 +77,7 @@
         auto back = m_allocations.rbegin();
         lldb::addr_t addr = back->first;
         size_t alloc_size = back->second.m_size;
-        ret = llvm::RoundUpToAlignment(addr+alloc_size, 4096);
+        ret = llvm::alignTo(addr+alloc_size, 4096);
     }
 
     return ret;