[PATCH] Implements Parts of Intrin.h

[G M]

I don't know if this is relevant or adds to your conversation but it seems
a few things I see are related:

* I fixed the always inline warnings for libcxx so they don't appear
anymore for cl based compiles at least. I haven't seen any warnings at
least related to libcxx using g++/clang++/cl.exe for that particular error
now once that patch is applied.

* When compiling with cl.exe in the win32 configuration I get these errors:

c:\libcxx\include\support/win32/support.h(98): error C3861:
'_BitScanReverse64': identifier not found

c:\libcxx\include\support/win32/support.h(113): error C3861:
'_BitScanForward64': identifier not found


Because neither function seems to be available for Win32
configurations, but if you compile using for Win64 configuration it
compiles fine. I need to add some non intrinsic support for cl for the 32
bit case I am thinking for cl and the MSVCRT.



* I was going to propose a patch to add "#pragma clang system_header" to a
"\libcxx\include\support\win32\support.h" and other such files in the
support folders.

Is there any reason why I shouldn't.



PS

Of the wall, probably not thought out question: shouldn't the system header
indicator be hereditary. i.e. any file that is a system header that
includes another file, then that should be seen as a system header too. I'm
not asking anyone to make that change, but is it conceptually sound?



Thanks
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