testsuite: Fix TestCompDirSymLink and TestSourceManager on Linux with symlinked build dir

testsuite: Fix TestCompDirSymLink and TestSourceManager on Linux with symlinked build dir

Getting failure when building in a directory which is symlinked elsewhere:

Failing Tests (1):
    lldb-Suite :: functionalities/breakpoint/comp_dir_symlink/TestCompDirSymLink.py
    lldb-Suite :: source-manager/TestSourceManager.py

For TestCompDirSymLink:
------------------------------------------------------------------------------
runCmd: file .../lldb-test-build.noindex/functionalities/breakpoint/comp_dir_symlink/TestCompDirSymLink.test_symlink_paths_set_procselfcwd_dwarf/CompDirSymLink
output: Current executable set to '.../lldb-test-build.noindex/functionalities/breakpoint/comp_dir_symlink/TestCompDirSymLink.test_symlink_paths_set_procselfcwd_dwarf/CompDirSymLink' (x86_64).
runCmd: settings set plugin.symbol-file.dwarf.comp-dir-symlink-paths /proc/self/cwd
output: None
runCmd: breakpoint set -f ".../lldb-test-build.noindex/functionalities/breakpoint/comp_dir_symlink/TestCompDirSymLink.test_symlink_paths_set_procselfcwd_dwarf/relative.cpp" -l 11
output: Breakpoint 1: no locations (pending).
WARNING:  Unable to resolve breakpoint to any actual locations.

It is because /proc/self/cwd (used above for plugin.symbol-file.dwarf.comp-dir-symlink-paths) points to an already resolved directory:

(cd /tmp;mkdir real;ln -s real symlink;cd symlink;ls -l /proc/self/cwd)
lrwxrwxrwx 1 jkratoch jkratoch 0 Feb 20 19:55 /proc/self/cwd -> /tmp/real/
------------------------------------------------------------------------------

For TestSourceManager the resolving is done by 'make -C' as found by Pavel Labath.

Differential Revision: https://reviews.llvm.org/D58465

llvm-svn: 354556