Fix a bunch of trivial cases of 'CHECK[^:]*$' in the tests. NFCI

I looked into adding a warning / error for this to FileCheck, but there doesn't
seem to be a good way to avoid it triggering on the instances of it in RUN lines.

llvm-svn: 244481
diff --git a/llvm/test/CodeGen/X86/fma-do-not-commute.ll b/llvm/test/CodeGen/X86/fma-do-not-commute.ll
index 1f6a19c..89be079 100644
--- a/llvm/test/CodeGen/X86/fma-do-not-commute.ll
+++ b/llvm/test/CodeGen/X86/fma-do-not-commute.ll
@@ -6,7 +6,7 @@
 
 ; CHECK-LABEL: test1:
 ; %arg lives in xmm0 and it shouldn't be redefined until it is used in the FMA.
-; CHECK-NOT {{.*}}, %xmm0
+; CHECK-NOT: {{.*}}, %xmm0
 ; %addr lives in rdi.
 ; %addr2 lives in rsi.
 ; CHECK: vmovss (%rsi), [[ADDR2:%xmm[0-9]+]]