s390: improve floating point and integer convertion

src/s390/assembler-s390.cc

Index: src/s390/assembler-s390.cc
diff --git a/src/s390/assembler-s390.cc b/src/s390/assembler-s390.cc
index fba9ed29a4ee6f5389b3bf5d207e556e25cfb749..d5d0ebe106131a5b312ddbbf860503e93ba4cfc4 100644
--- a/src/s390/assembler-s390.cc
+++ b/src/s390/assembler-s390.cc
@@ -1949,10 +1949,8 @@ void Assembler::clgebr(Condition m3, Condition m4, Register r1,
 // Convert to Fixed Logical (32<-F64)
 void Assembler::clfdbr(Condition m3, Condition m4, Register r1,
                        DoubleRegister r2) {
-  DCHECK_EQ(m3, Condition(0));
   DCHECK_EQ(m4, Condition(0));
-  rrfe_form(CLFDBR, Condition(0), Condition(0), r1,
-            Register::from_code(r2.code()));
+  rrfe_form(CLFDBR, m3, Condition(0), r1, Register::from_code(r2.code()));
 }
 
 // Convert to Fixed Logical (32<-F32)