[sanitizer_common tests] Make Darwin a Posix system and bring the stable-runtime definition from ASan tests.

Summary: This is an initial setup in order to move some additional tests from Linux onto Posix.
I also moved decorate_proc_maps onto the Linux directory

Finally added msan's definition for "stable-runtime".
Only a test requires it, and its commit message (r248014) seems to imply
that AArch64 is problematic with MSan.

Reviewers: samsonov, rengolin, t.p.northover, eugenis

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D17928

llvm-svn: 263142

compiler-rt/test/msan/lit.cfg

@@ -32,3 +32,6 @@ config.suffixes = ['.c', '.cc', '.cpp']
 # MemorySanitizer tests are currently supported on Linux only.
 if config.host_os not in ['Linux']:
   config.unsupported = True
+
+if config.target_arch != 'aarch64':
+  config.available_features.add('stable-runtime')

compiler-rt/test/sanitizer_common/TestCases/Posix/lit.local.cfg

@@ -5,5 +5,5 @@ def getRoot(config):
 
 root = getRoot(config)
 
-if root.host_os in ['Windows', 'Darwin']:
+if root.host_os in ['Windows']:
   config.unsupported = True

compiler-rt/test/sanitizer_common/lit.common.cfg

@@ -23,6 +23,9 @@ else:
 
 config.available_features.add(config.tool_name)
 
+if config.target_arch not in ['arm', 'armhf', 'aarch64']:
+  config.available_features.add('stable-runtime')
+
 if config.host_os == 'Darwin':
   # On Darwin, we default to `abort_on_error=1`, which would make tests run
   # much slower. Let's override this and run lit tests with 'abort_on_error=0'.