[PATCH] [mips][FastISel] Implement intrinsics memset, memcopy & memmove.

[Daniel Sanders]

LGTM


================
Comment at: lib/Target/Mips/MipsFastISel.cpp:480
@@ +479,3 @@
+  if (const auto *I = dyn_cast<Instruction>(V)) {
+    if (I->getParent() == FuncInfo.MBB->getBasicBlock()) {
+      Opcode = I->getOpcode();
----------------
Nit: Could you add a comment about why we require the same BB?

http://reviews.llvm.org/D7158

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