[PATCH] [mips][FastISel] Handle calls with non legal types i8 and i16.

[Daniel Sanders]

LGTM with a nit


================
Comment at: test/CodeGen/Mips/Fast-ISel/callabi.ll:11
@@ +10,3 @@
+define void @cxb() {
+; ALL-LABEL:    cxb:
+
----------------
Nit: Indentation

http://reviews.llvm.org/D6770

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