Add a first attempt at implementing stores for X86 fast isel using target hooks.
Dan or Evan, please review.

llvm-svn: 55764
diff --git a/llvm/test/CodeGen/X86/fast-isel-mem.ll b/llvm/test/CodeGen/X86/fast-isel-mem.ll
index 81af0ab..5c39fb4 100644
--- a/llvm/test/CodeGen/X86/fast-isel-mem.ll
+++ b/llvm/test/CodeGen/X86/fast-isel-mem.ll
@@ -1,5 +1,5 @@
 ; RUN: llvm-as < %s | llc -fast-isel -mtriple=i386-apple-darwin -mattr=sse2 | \
-; RUN:   grep mov | grep lazy_ptr | count 1
+; RUN:   grep mov | grep lazy_ptr | count 2
 
 @src = external global i32
 
@@ -8,5 +8,6 @@
 	%0 = load i32* @src, align 4
 	%1 = load i32* @src, align 4
         %2 = add i32 %0, %1
+  store i32 %2, i32* @src
 	ret i32 %2
 }