Use the process' ReadCStringFromMemory from DYLDRendezvous::ReadStringFromMemory.

Tested:
Ubuntu 14.04 x86_64, clang-3.5-built lldb.
MacOSX 10.9.4, Xcode6-Beta7-built lldb.

Visual packet inspection on lldb <-> llgs shows significant reduction in overly-verbose
memory read traffic on start-up when scanning shared library info.

Change by Stephane Sezer.

llvm-svn: 217153

Author: tfiala

lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DYLDRendezvous.cpp

@@ -320,23 +320,11 @@ DYLDRendezvous::ReadStringFromMemory(addr_t addr)
 {
     std::string str;
     Error error;
-    size_t size;
-    char c;
 
     if (addr == LLDB_INVALID_ADDRESS)
         return std::string();
 
-    for (;;) {
-        size = m_process->DoReadMemory(addr, &c, 1, error);
-        if (size != 1 || error.Fail())
-            return std::string();
-        if (c == 0)
-            break;
-        else {
-            str.push_back(c);
-            addr++;
-        }
-    }
+    m_process->ReadCStringFromMemory(addr, str, error);
 
     return str;
 }