S390: fix DCHECK in store f32 and f64

Change-Id: Ie7fbaebda580787a6261f0bc56fc1bde370148e4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2698928Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#72828}

src/codegen/s390/macro-assembler-s390.cc

@@ -3782,14 +3782,14 @@ void TurboAssembler::StoreU16LE(Register src, const MemOperand& mem,
 
 void TurboAssembler::StoreF64LE(DoubleRegister src, const MemOperand& opnd,
                                 Register scratch) {
-  DCHECK(!is_int20(opnd.offset()));
+  DCHECK(is_uint12(opnd.offset()));
   lgdr(scratch, src);
   strvg(scratch, opnd);
 }
 
 void TurboAssembler::StoreF32LE(DoubleRegister src, const MemOperand& opnd,
                                 Register scratch) {
-  DCHECK(!is_int20(opnd.offset()));
+  DCHECK(is_uint12(opnd.offset()));
   lgdr(scratch, src);
   ShiftRightU64(scratch, scratch, Operand(32));
   strv(scratch, opnd);