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[mips] Add initial support for NaN2008 in the back-end.
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[mips] Add initial support for NaN2008 in the back-end.

This is so that EF_MIPS_NAN2008 is set if we are using IEEE 754-2008
NaN encoding (-mnan=2008). This patch also adds support for parsing
'.nan legacy' and '.nan 2008' assembly directives. The handling of
these directives should match GAS' behaviour i.e., the last directive
in use sets the ELF header bit (EF_MIPS_NAN2008).

Differential Revision: http://reviews.llvm.org/D3346

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dsanders accepted this commit.Apr 29 2014, 7:41 AM