[ASan] Link with the dynamic runtime on OS X
This patch changes the behavior of the -fsanitize=address flag, making it use the dynamic runtime library (libclang_rt.asan_osx_dynamic.dylib) instead of the static one. It also drops the CoreFoundation dependency, since the dynamic runtime doesn't need it.



git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@173135 91177308-0d34-0410-b5e6-96231b3b80d8
[ASan] Fixed darwin-sanitizer-ld.c to match the flags after the switch to the dynamic runtime.



git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@173137 91177308-0d34-0410-b5e6-96231b3b80d8
Switch to APFloat constructor taking fltSemantics.

This change also makes the serialisation store the required semantics,
fixing an issue where PPC128 was always assumed when re-reading a
128-bit value.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@173139 91177308-0d34-0410-b5e6-96231b3b80d8