[PATCH] __register_frame() when cross-building on Windows

[Yaron Keren]

Hi,

The HAVE_EHTABLE_SUPPORT logic in
lib\ExecutionEngine\RTDyldMemoryManager.cpp assumes that if
__register_frame() is not available on the building compiler, it's not
available in the target. For example, this happens on Windows when building
LLVM with Visual C++ but using the MingW runtime.

The attached patch tries (once) to find __register_frame() in the loaded
dynamic libraries at runtime if it wasn't linked at compile time.

Yaron
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