Revert "Use trampolines for calls to helpers"

This reverts commit 754ddad084ccb610d0cf486f6131bdc69bae5bc6.

Change-Id: Icd979adee1d8d781b40a5e75daf3719444cb72e8
diff --git a/compiler/dex/quick/arm/utility_arm.cc b/compiler/dex/quick/arm/utility_arm.cc
index 8e6d9a8..70cbdd2 100644
--- a/compiler/dex/quick/arm/utility_arm.cc
+++ b/compiler/dex/quick/arm/utility_arm.cc
@@ -1111,14 +1111,8 @@
 }
 
 LIR* ArmMir2Lir::OpThreadMem(OpKind op, ThreadOffset<4> thread_offset) {
-  if (op == kOpBlx) {
-    const uint32_t trampoline = cu_->compiler_driver->AddEntrypointTrampoline(
-        thread_offset.Int32Value());
-    return NewLIR1(kThumb2BlTramp, trampoline);
-  } else {
-    LOG(FATAL) << "Invalid opcode for ARM OpThreadMem on Arm";
-    return NULL;
-  }
+  LOG(FATAL) << "Unexpected use of OpThreadMem for Arm";
+  return NULL;
 }
 
 LIR* ArmMir2Lir::OpMem(OpKind op, RegStorage r_base, int disp) {