Enable the new no-SP register classes by default. This is to address

PR4572. A few tests have some minor code regressions due to different
coalescing.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78217 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/X86/coalesce-esp.ll

@@ -1,4 +1,4 @@
-; RUN: llvm-as < %s | llc -strict-index-regclass | grep {movl	%esp, %eax}
+; RUN: llvm-as < %s | llc | grep {movl	%esp, %eax}
 ; PR4572
 
 ; Don't coalesce with %esp if it would end up putting %esp in