[PATCH] Fix illegal relocations in X86FastISel

[Louis Gerbarg]

It turns out we have been generating illegal relocations in X86FastISel when compiling static 64 bit code for years. In many cases the illegal code actually worked because of how the binaries were laid out, but it could also fail or generate bad code.

As it turns out this mis-generated code also happens to be occur in the test case test/DebugInfo/X86/debug-loc-asan.ll, so the fix breaks that. I have included fixes for that test case as well, but someone should look it over as I am not familiar with the asan annotations.

Louis
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