empty ranges.

2. Reorg how MachineDebugInfo maintains changes to debug labels.

3. Have dwarf writer use debug label info to simplify scopes and source line
coorespondence.

4. Revert the merging of compile units until I can get the bugs ironed out.

llvm-svn: 31507

llvm-svn: 31506

by 40%, FreeBench/fourinarow by 20%, and many other programs 10-25%.

On PPC, this speeds up fourinarow by 18%, and probably other things as well.

llvm-svn: 31504

llvm-svn: 31502

llvm-svn: 31501

llvm-svn: 31500

llvm-svn: 31499

llvm-svn: 31498

llvm-svn: 31497

llvm-svn: 31496

information.

llvm-svn: 31495

X86.  If happy, I'll enable this by default.

llvm-svn: 31493

llvm-svn: 31492

llvm-svn: 31491

llvm-svn: 31488

The low part goes in the first operand of expandop, not the second one.

llvm-svn: 31487

llvm-svn: 31486

llvm-svn: 31485

llvm-svn: 31484

llvm-svn: 31483

of an M_PREDICATED instruction.

llvm-svn: 31482

to extend.

llvm-svn: 31481

llvm-svn: 31480

folding

llvm-svn: 31479

llvm-svn: 31478

llvm-svn: 31477

llvm-svn: 31476

NOTE: There doesn't seem to be consistency for whether a leading tab
is present in a section heading.

llvm-svn: 31475

llvm-svn: 31474

llvm-svn: 31473

llvm-svn: 31472

llvm-svn: 31471

llvm-svn: 31470

llvm-svn: 31469

llvm-svn: 31468

llvm-svn: 31467

llvm-svn: 31466

llvm-svn: 31465

llvm-svn: 31464

llvm-svn: 31463