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[X86] Add support for STRICT_FP_ROUND/STRICT_FP_EXTEND from/to fp128 to/from…

Authored by craig.topper on Mon, Nov 25, 5:14 PM.

Description

[X86] Add support for STRICT_FP_ROUND/STRICT_FP_EXTEND from/to fp128 to/from f32/f64/f80 in 64-bit mode.

These need to emit a libcall like we do for the non-strict version.

32-bit mode needs to SoftenFloat support to be implemented for strict FP nodes.

Differential Revision: https://reviews.llvm.org/D70504