Unbreak Win64 CC. Step one: honour register save area, fix some alignment and provide a different set of call-clobberred registers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77962 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/X86/2009-06-03-Win64DisableRedZone.ll b/test/CodeGen/X86/2009-06-03-Win64DisableRedZone.ll
index c628b8a..a96fcb2 100644
--- a/test/CodeGen/X86/2009-06-03-Win64DisableRedZone.ll
+++ b/test/CodeGen/X86/2009-06-03-Win64DisableRedZone.ll
@@ -1,4 +1,4 @@
-; RUN: llvm-as < %s | llc | grep "subq.*\\\$8, \\\%rsp"
+; RUN: llvm-as < %s | llc | grep "subq.*\\\$40, \\\%rsp"
 target triple = "x86_64-mingw64"
 
 define x86_fp80 @a(i64 %x) nounwind readnone {