Switching the DIFile field in DISubprogram to refer to the raw
filename/directory pair instead of a DIFile.

llvm-svn: 177676

(this will produce some transient test failure/skew)

llvm-svn: 177673

Checking for the annotation comment rather than the metadata values makes these
tests resilient to a coming refactor that will pull these fields out into a
separate metadata node.

llvm-svn: 177237

llvm-svn: 137767

automatically.  Use -S with llvm-gcc rather than -c, so tests can
work when llvm-gcc is really dragonegg (which can output IR with -S
but not -c).

llvm-svn: 120160

llvm-svn: 109521

llvm-svn: 109258