Remove unnecessary throw() specifications; LLVM doesn't use exceptions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78667 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/RegAllocPBQP.cpp

@@ -74,7 +74,7 @@ namespace {
     PBQPRegAlloc() : MachineFunctionPass(&ID) {}
 
     /// Return the pass name.
-    virtual const char* getPassName() const throw() {
+    virtual const char* getPassName() const {
       return "PBQP Register Allocator";
     }