[PATCH] [mips] Add support for accessing $gp as a named register.

[Simon Atanasyan]

LGTM (with a nit).


================
Comment at: lib/Target/Mips/MipsISelLowering.h:265
@@ -264,1 +264,3 @@
 
+    unsigned getRegisterByName(const char* RegName, EVT VT) const;
+
----------------
Missed `override` keyword?

http://reviews.llvm.org/D6893

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