[PATCH] [MIPS] fix extension of integer types (function calls)

[Simon Atanasyan]

================
Comment at: lib/CodeGen/ABIInfo.h:93
@@ -92,1 +92,3 @@
 
+    virtual bool shouldSignExtUnsignedType(QualType Ty) const {
+      return false;
----------------
Nit: Just for consistency let's:
  - define this routine in the cpp file
  - move the declaration closer to other virtual functions declared in this class

================
Comment at: lib/CodeGen/TargetInfo.cpp:5800
@@ +5799,3 @@
+    return true;
+  else
+    return false;
----------------
Nit: **else-after-return** violation.

```
return Ty->isUnsignedIntegerOrEnumerationType() && TySize == 32;
```
or

```
if (Ty->isUnsignedIntegerOrEnumerationType() && TySize == 32)
  return true;

return false;
```

And +1 for comment

http://reviews.llvm.org/D9198

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