[wasm][arm] Emit MaybeCheckConstPool in the trap code generation

Without the check it happened that the builtin call in the trap code
was too far away from the constant pool and therefore crashed.

BUG=v8:6054
R=bmeurer@chromium.org, v8-arm-ports@googlegroups.com

Review-Url: https://codereview.chromium.org/2738683003
Cr-Commit-Position: refs/heads/master@{#43928}

src/arm/macro-assembler-arm.cc

@@ -102,6 +102,8 @@ void MacroAssembler::Call(Address target,
                           RelocInfo::Mode rmode,
                           Condition cond,
                           TargetAddressStorageMode mode) {
+  // Check if we have to emit the constant pool before we block it.
+  MaybeCheckConstPool();
   // Block constant pool for the call instruction sequence.
   BlockConstPoolScope block_const_pool(this);
   Label start;
@@ -147,11 +149,8 @@ int MacroAssembler::CallSize(Handle<Code> code,
   return CallSize(reinterpret_cast<Address>(code.location()), rmode, cond);
 }
 
-
-void MacroAssembler::Call(Handle<Code> code,
-                          RelocInfo::Mode rmode,
-                          TypeFeedbackId ast_id,
-                          Condition cond,
+void MacroAssembler::Call(Handle<Code> code, RelocInfo::Mode rmode,
+                          TypeFeedbackId ast_id, Condition cond,
                           TargetAddressStorageMode mode) {
   Label start;
   bind(&start);