[ARM] Save all single precision float registers in the deoptimizer.

- All ARM hardware has 32 single precision float registers; save all
  s-registers regardless of the number of d-registers (16 or 32).

LOG=N
BUG=v8:6077

Review-Url: https://codereview.chromium.org/2821273004
Cr-Commit-Position: refs/heads/master@{#44810}

src/arm/deoptimizer-arm.cc

@@ -141,11 +141,8 @@ void Deoptimizer::TableEntryGenerator::Generate() {
     __ sub(sp, sp, Operand(16 * kDoubleSize), LeaveCC, eq);
     __ vstm(db_w, sp, d0, d15);
 
-    // Push registers s0-s15, and possibly s16-s31, on the stack.
-    // If s16-s31 are not pushed, decrease the stack pointer instead.
-    __ vstm(db_w, sp, s16, s31, ne);
-    __ sub(sp, sp, Operand(16 * kFloatSize), LeaveCC, eq);
-    __ vstm(db_w, sp, s0, s15);
+    // Push registers s0-s31 on the stack.
+    __ vstm(db_w, sp, s0, s31);
   }
 
   // Push all 16 registers (needed to populate FrameDescription::registers_).