[PATCH] Returns NaN for sqrt with negative fp argument

[Jiangning Liu]

Hi,

IEEE-754 standard requires to return NaN for sqrt with negative fp value
argument, while llvm now is returning fp zero instead. This patch is to fix
this issue and spec2006/483.xanlancbmk can pass with -ffast-math for
AArch64 target, but the fix itself is a general one rather than target
specific.

Also, sqrt in glibc behaves like this, and clang is defining __GNUC__, so
it means we need to keep compatibility with GCC around this as well.

Thanks,
-Jiangning
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