XFAIL tests that are failed on linux with gcc-4.9.2

XFAIL tests that are failed on linux with gcc-4.9.2

Summary:
- add decorator functions to xfail and skip test on specific os, architecture and version of comipler
- xfail failing test with gcc-4.9.2 on linux
- add one usage of skipIf function

Test Plan:
Run tests with different archs, and version of compilers to verify decorator function working as expected
Run tests with gcc-4.9.2 and no failure reported

Reviewers: sivachandra, ovyalov, vharron, chaoren

Subscribers: lldb-commits

Differential Revision: http://reviews.llvm.org/D8851

llvm-svn: 235368