Add x86 fast-isel for calls returning first-class aggregates.  rdar://9435872.

This is r131438 with a couple small fixes.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131474 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/X86/fast-isel-extract.ll b/test/CodeGen/X86/fast-isel-extract.ll
index e51c417..f63396e 100644
--- a/test/CodeGen/X86/fast-isel-extract.ll
+++ b/test/CodeGen/X86/fast-isel-extract.ll
@@ -1,4 +1,4 @@
-; RUN: llc < %s -mtriple x86_64-apple-darwin11 -O0 | FileCheck %s
+; RUN: llc < %s -mtriple x86_64-apple-darwin11 -O0 -fast-isel-abort | FileCheck %s
 
 %struct.x = type { i64, i64 }
 %addovf = type { i32, i1 }