[turbofan] Emit constant pool before blocking it in AssembleArchTableSwitch.

BUG=chromium:468749
LOG=NO
TEST=Emscripten/NBodyJava

Review URL: https://codereview.chromium.org/1014093005

Cr-Commit-Position: refs/heads/master@{#27322}

src/compiler/arm/code-generator-arm.cc

@@ -802,6 +802,7 @@ void CodeGenerator::AssembleArchTableSwitch(Instruction* instr) {
   ArmOperandConverter i(this, instr);
   Register input = i.InputRegister(0);
   size_t const case_count = instr->InputCount() - 2;
+  __ CheckConstPool(true, true);
   __ cmp(input, Operand(case_count));
   __ BlockConstPoolFor(case_count + 2);
   __ ldr(pc, MemOperand(pc, input, LSL, 2), lo);