gallivm: Pass in CPU name to createTargetMachine when on llvm-3.0.

llvm-3.0svn revision 134127 changed createTargetMachine to take in
an additional argument of the CPU name.

src/gallium/auxiliary/gallivm/lp_bld_debug.cpp

@@ -207,7 +207,11 @@ lp_disassemble(const void* func)
    }
 
    raw_debug_ostream Out;
+#if HAVE_LLVM >= 0x0300
+   TargetMachine *TM = T->createTargetMachine(Triple, sys::getHostCPUName(), "");
+#else
    TargetMachine *TM = T->createTargetMachine(Triple, "");
+#endif
 
 #if HAVE_LLVM >= 0x0300
    unsigned int AsmPrinterVariant = AsmInfo->getAssemblerDialect();