[PATCH] Target/X86: Save Win64 non-volatile registers in a Win64 ABI function.

[Reid Kleckner]

lgtm


================
Comment at: test/CodeGen/X86/win64_nonvol.ll:7-11
@@ +6,7 @@
+
+; CHECK-LABEL: foo:
+define x86_64_sysvcc void @foo(i32 %a, i32 %b) {
+; CHECK: ret
+  ret void
+}
+
----------------
This can be simplified to a declaration.

http://reviews.llvm.org/D7919

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