Add support for programs that define main in a .a file, such as f2c'd programs.

llvm-svn: 20631

llvm-svn: 20630

llvm-svn: 20629

so that external globals (and whatever they point to) are marked incomplete.

llvm-svn: 20628

llvm-svn: 20627

 { short, short }

to
  short

where the second short maps onto the second field of the first struct.  In
this case, the struct index is not aligned, so we should avoid calling
getLink(2), which asserts out.

llvm-svn: 20626

llvm-svn: 20623

llvm-svn: 20622

llvm-svn: 20621

llvm-svn: 20620

void foo() {
  G = 1;
}

would have an empty DSGraph even though G (a global) is directly used
in the function.

llvm-svn: 20619

llvm-svn: 20618

llvm-svn: 20617

llvm-svn: 20616

llvm-svn: 20615

llvm-svn: 20614

llvm-svn: 20610

llvm-svn: 20609

llvm-svn: 20608

llvm-svn: 20607

llvm-svn: 20606

llvm-svn: 20605

llvm-svn: 20604

llvm-svn: 20603

llvm-svn: 20602

llvm-svn: 20601

llvm-svn: 20600

llvm-svn: 20599

llvm-svn: 20598

using Function::arg_{iterator|begin|end}.  Likewise Module::g* -> Module::global_*.

This patch is contributed by Gabor Greif, thanks!

llvm-svn: 20597

llvm-svn: 20596

llvm-svn: 20595

llvm-svn: 20593

llvm-svn: 20592

Rename argument iterators arg_* instead of a*
Remove global variable iterators global_* instead of g*.

Keep the old names for temporary compatibility.

Patch contributed by Gabor Greif!

llvm-svn: 20591

llvm-svn: 20589

llvm-svn: 20588

llvm-svn: 20587

ALWAYS mark them incomplete if they are external!

llvm-svn: 20586

llvm-svn: 20585