Name string length is end position marker - begin position marker.

llvm-svn: 53697
diff --git a/llvm/tools/lto/LTOModule.cpp b/llvm/tools/lto/LTOModule.cpp
index ac38d24..cef6922 100644
--- a/llvm/tools/lto/LTOModule.cpp
+++ b/llvm/tools/lto/LTOModule.cpp
@@ -329,7 +329,7 @@
           if (pend == std::string::npos)
             break;
 
-          asmSymbolName.assign(inlineAsm, pbegin, pbegin-pend);
+          asmSymbolName.assign(inlineAsm, pbegin, pend - pbegin);
           addAsmGlobalSymbol(asmSymbolName.c_str());
 
           // search next .globl