Merge pull request flang-compiler#66 from schweitzpgi/release_70

fixes a bug with COMMON blocks when both debug and optimizations are on

Merge pull request flang-compiler#61 from schweitzpgi/release_70

merge latest from llvm mirror - Release 70

Merge pull request flang-compiler#49 from schweitzpgi/release_60

Changes to support the generation of DW_TAG_common_block (DWARF debug…

Merge pull request flang-compiler#44 from flang-compiler/sles11

Change for SLES 11 support.

Merge pull request flang-compiler#34 from schweitzpgi/release_50

[not flang] merge LLVM Release 50 changes

Merge pull request flang-compiler#34 from schweitzpgi/release_50

[not flang] merge LLVM Release 50 changes