Heavily refactor handleVirtualRegisterDef, adding comments and making it more
efficient.  It is also much easier to follow and convince ones self that it is
correct :)

Add -debug output to the joine, showing the result of joining the intervals.

llvm-svn: 14989

remove map that is not needed

llvm-svn: 14988

llvm-svn: 14987

llvm-svn: 14983

and a list of don'ts for the library. All so future maintainers don't
break the important contract this library has with its user: LLVM.

llvm-svn: 14979

llvm-svn: 14977

llvm-svn: 14976

llvm-svn: 14974

night compiling cfrac.  It did not realize that code like this:

int G; int *H = &G;

takes the address of G.

llvm-svn: 14973

llvm-svn: 14972

llvm-svn: 14971

llvm-svn: 14968

llvm-svn: 14967

llvm-svn: 14966

llvm-svn: 14965

too.

llvm-svn: 14964

llvm-svn: 14963

llvm-svn: 14962

llvm-svn: 14961

llvm-svn: 14960

llvm-svn: 14958

llvm-svn: 14957

llvm-svn: 14956

- Replace ConstantPointerRef usage with GlobalValue usage

llvm-svn: 14953

- Replace ConstantPointerRef usage with GlobalValue usage
- Correct isa<Constant> for GlobalValue subclass

llvm-svn: 14951

- Replace ConstantPointerRef usage with GlobalValue usage
- Minimize redundant isa<GlobalValue> usage
- Correct isa<Constant> for GlobalValue subclass

llvm-svn: 14950

- Correct isa<Constant> for GlobalValue subclass

llvm-svn: 14949

- Minimize redundant isa<GlobalValue> usage

llvm-svn: 14948

- Replace ConstantPointerRef usage with GlobalValue usage
- Correct isa<Constant> for GlobalValue subclass

llvm-svn: 14947

- Minimize redundant isa<GlobalValue> usage
- Correct isa<Constant> for GlobalValue subclass

llvm-svn: 14946

- Replace ConstantPointerRef usage with GlobalValue usage
- Rename methods to get ride of ConstantPointerRef usage

llvm-svn: 14945

- Excise dead CPR procesing.

llvm-svn: 14944

- Replace ConstantPointerRef usage with GlobalValue usage
- Correct test ordering for GlobalValue subclass

llvm-svn: 14943

- Replace ConstantPointerRef usage with GlobalValue usage
- Minimize redundant isa<GlobalValue> usage
- Correct isa<Constant> for GlobalValue subclass

llvm-svn: 14942

- Correct ordering of tests because for GlobalValue isa Constant

llvm-svn: 14941

from being treated like a Function which can cause the contents of the list
to be come invalidated.

llvm-svn: 14940

- Replace ConstantPointerRef usage with GlobalValue usage
- Correct isa<Constant> for GlobalValue subclass

llvm-svn: 14939

- Update for BytecodeHandler interface change resuing from CPRs going away

llvm-svn: 14938

- Replace ConstantPointerRef usage with GlobalValue usage
- Minimize redundant isa<GlobalValue> usage
- Correct isa<Constant> for GlobalValue subclass
- Remove tabs
- Fix coments refering to ConstantPointerRef

llvm-svn: 14937

- Move these functions from other places
- Provide implementations of Constant class overrides in GlobalValue

llvm-svn: 14936