Add simple counter to count no. of basic blocks without any line number information. At -O0, these basic block coule cause less than optimial debugging experience.

llvm-svn: 117307

llvm-svn: 116061

llvm-svn: 115988

llvm-svn: 115833

llvm-svn: 115378

llvm-svn: 115102

llvm-svn: 115089

llvm-svn: 115067

llvm-svn: 114969

llvm-svn: 114920

llvm-svn: 114585

If FE forgot to provide a file name (usually it uses "stdin" as name in such situation) then make one up to ensure that debug info is not malformed.

llvm-svn: 114119

llvm-svn: 112830

This patch was developed on top of original patch by Artur Pietrek.

llvm-svn: 112678

llvm-svn: 112659

llvm-svn: 112631

Remember byval argument's frame index during argument lowering and use this info to emit debug info.
Fixes Radar 8367011.

llvm-svn: 112623

llvm-svn: 112583

llvm-svn: 111870

PR 7920.

llvm-svn: 111820

llvm-svn: 110712

llvm-svn: 110656

llvm-svn: 110653

llvm-svn: 110652

Refactor and simplify code to avoid redundant checks.

llvm-svn: 110642

llvm-svn: 110623

llvm-svn: 110621

llvm-svn: 110607

llvm-svn: 110600

llvm-svn: 110590

llvm-svn: 110586

llvm-svn: 110255

llvm-svn: 110244

llvm-svn: 110234

llvm-svn: 110045

llvm-svn: 109538

Use current working directory when Dirname is empty. This only happens when absolute source file path is used on compiler command line.

llvm-svn: 109302

llvm-svn: 109285

llvm-svn: 109262

rdar://8202967

llvm-svn: 109057