do not sign extend characters input to isprint.  This improves
compatibility with VC++.  Patch by Max Burke!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62813 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 5085fd4..50cd24b 100644
--- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -681,7 +681,7 @@
     O << "\\\"";
   } else if (C == '\\') {
     O << "\\\\";
-  } else if (isprint(C)) {
+  } else if (isprint((unsigned char)C)) {
     O << C;
   } else {
     switch(C) {