element" structures.

llvm-svn: 71266

 - This turns out to be a no-op now that most of the handling for
   everything else is in place.

llvm-svn: 71261

 - This eliminates 5/1000 failures on return-types-32, on the current
   ABITest config.

llvm-svn: 71250

member.

Also, spell bitfield more consistently as bit-field.

llvm-svn: 70220

 - Small structures are returned in a register if: 
    1. They fit nicely in a  register.
    2. All fields fit nicely in a register.
   (more or less)

 - We now pass the first 5000 ABITests if unions are disabled.

 - <rdar://problem/6497882> [irgen] x86-32 ABI compatibility with
   small structs

llvm-svn: 68197

element structures", which have different ABI rules.
 - Current return-arguments-32 status is: 1 out of 1000 failures (-7)

 - Also, vectors inside "single element structs" require special
   handling.

llvm-svn: 68196

 - Current return-arguments-32 status is: 8 out of 1000 failures (-7)

llvm-svn: 68192

 - Current return-arguments-32 status: 15/1000 failures

llvm-svn: 68132

Tests and drivers updated, still need to shuffle dirs.

llvm-svn: 67602

llvm-svn: 67592

 - This is an ABI incompatiblity, but this is not likely to be a huge
   deal in practice. For now we at least generate self consistent code
   instead of crashing.
 - <rdar://problem/6657601> x86-32 ABI: Bitfields in small structures
   are not passed correctly

llvm-svn: 66713