Add missing std:: prefixes to some calls. C++ doesn't require that <cfoo>
headers provide symbols outside namespace std and the LLVM coding standards
state that we should prefix all of them.

llvm-svn: 122192
diff --git a/llvm/lib/Target/TargetInstrInfo.cpp b/llvm/lib/Target/TargetInstrInfo.cpp
index eca97ab..d4986d8 100644
--- a/llvm/lib/Target/TargetInstrInfo.cpp
+++ b/llvm/lib/Target/TargetInstrInfo.cpp
@@ -164,7 +164,7 @@
   for (; *Str; ++Str) {
     if (*Str == '\n' || *Str == MAI.getSeparatorChar())
       atInsnStart = true;
-    if (atInsnStart && !isspace(*Str)) {
+    if (atInsnStart && !std::isspace(*Str)) {
       Length += MAI.getMaxInstLength();
       atInsnStart = false;
     }