[PATCH] [mips] Make sure that we don't adjust the stack pointer by zero amount.

[Daniel Sanders]

LGTM with the check for 'Amount == 0' inside adjustStackPtr(). Each caller shouldn't have to check this for itself.


================
Comment at: test/CodeGen/Mips/adjust-callstack-sp.ll:14-16
@@ +13,5 @@
+
+    ; M16-NOT:        addiu     $sp, 0 # 16 bit inst
+    ; GP32-NOT:       addiu     $sp, $sp, 0
+    ; GP64-NOT:       daddiu    $sp, $sp, 0
+  %a = alloca i32, i32 %sz
----------------
Nit: Indentation.

http://reviews.llvm.org/D8638

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