Subzero: Remove IceString.

src/IceMangling.cpp

 //===- subzero/src/IceMangling.cpp - Cross test name mangling --*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 99 matching lines @@
   }
   assert(NewName[NewPos] == '\0');
   OldName = NewName;
 }
 
 } // end of anonymous namespace
 
 // In this context, name mangling means to rewrite a symbol using a given
 // prefix. For a C++ symbol, nest the original symbol inside the "prefix"
 // namespace. For other symbols, just prepend the prefix.
-IceString mangleName(const IceString &Name) {
+std::string mangleName(const std::string &Name) {
   // An already-nested name like foo::bar() gets pushed down one level, making
   // it equivalent to Prefix::foo::bar().
   //   _ZN3foo3barExyz ==> _ZN6Prefix3foo3barExyz
   // A non-nested but mangled name like bar() gets nested, making it equivalent
   // to Prefix::bar().
   //   _Z3barxyz ==> ZN6Prefix3barExyz
   // An unmangled, extern "C" style name, gets a simple prefix:
   //   bar ==> Prefixbar
   if (!BuildDefs::dump() || GlobalContext::getFlags().getTestPrefix().empty())
     return Name;
 
-  const IceString &TestPrefix = GlobalContext::getFlags().getTestPrefix();
+  const std::string TestPrefix = GlobalContext::getFlags().getTestPrefix();
   unsigned PrefixLength = TestPrefix.length();
   ManglerVector NameBase(1 + Name.length());
   const size_t BufLen = 30 + Name.length() + PrefixLength;
   ManglerVector NewName(BufLen);
   uint32_t BaseLength = 0; // using uint32_t due to sscanf format string
 
   int ItemsParsed = sscanf(Name.c_str(), "_ZN%s", NameBase.data());
   if (ItemsParsed == 1) {
     // Transform _ZN3foo3barExyz ==> _ZN6Prefix3foo3barExyz
     //   (splice in "6Prefix")          ^^^^^^^
@@ skipping 41 matching lines @@
     incrementSubstitutions(NewName);
     return NewName.data();
   }
 
   // Transform bar ==> Prefixbar
   //                   ^^^^^^
   return TestPrefix + Name;
 }
 
 } // end of namespace Ice