Modified the ArchSpec to take an optional "Platform *" when setting the triple.
This allows you to have a platform selected, then specify a triple using
"i386" and have the remaining triple items (vendor, os, and environment) set
automatically.

Many interpreter commands take the "--arch" option to specify an architecture
triple, so now the command options needed to be able to get to the current
platform, so the Options class now take a reference to the interpreter on
construction.

Modified the build LLVM building in the Xcode project to use the new
Xcode project level user definitions:

LLVM_BUILD_DIR - a path to the llvm build directory
LLVM_SOURCE_DIR - a path to the llvm sources for the llvm that will be used to build lldb
LLVM_CONFIGURATION - the configuration that lldb is built for (Release, 
Release+Asserts, Debug, Debug+Asserts).

I also changed the LLVM build to not check if "lldb/llvm" is a symlink and
then assume it is a real llvm build directory versus the unzipped llvm.zip
package, so now you can actually have a "lldb/llvm" directory in your lldb
sources.

llvm-svn: 129112
diff --git a/lldb/source/Core/EmulateInstruction.cpp b/lldb/source/Core/EmulateInstruction.cpp
index 8c3456e..7130360 100644
--- a/lldb/source/Core/EmulateInstruction.cpp
+++ b/lldb/source/Core/EmulateInstruction.cpp
@@ -315,7 +315,7 @@
                                        size_t length)
 {
     PrintContext ("Read from memory", context);
-    fprintf (stdout, "    Read from Memory (address = %p, length = %d)\n",(void *) addr, (uint) length);
+    fprintf (stdout, "    Read from Memory (address = %p, length = %d)\n",(void *) addr, (uint32_t) length);
     
     *((uint64_t *) dst) = 0xdeadbeef;
     return length;
@@ -329,7 +329,7 @@
                                         size_t length)
 {
     PrintContext ("Write to memory", context);
-    fprintf (stdout, "    Write to Memory (address = %p, length = %d)\n",  (void *) addr, (uint) length);
+    fprintf (stdout, "    Write to Memory (address = %p, length = %d)\n",  (void *) addr, (uint32_t) length);
     return length;
 }