Give Compiler a back reference to the driver.

The compiler driver is a single object delegating work to the compiler, rather
than passing it through to every Compiler call make it a member of Compiler so
that it maybe queried. This simplifies the Compiler API and makes the
relationship to CompilerDriver more explicit.
Remove reference arguments that contravene code style.

Change-Id: Iba47f2e3cbda679a7ec7588f26188d77643aa2c6
diff --git a/compiler/jni/quick/jni_compiler.cc b/compiler/jni/quick/jni_compiler.cc
index 9f439eb..5a22170 100644
--- a/compiler/jni/quick/jni_compiler.cc
+++ b/compiler/jni/quick/jni_compiler.cc
@@ -52,7 +52,7 @@
 //   registers, a reference to the method object is supplied as part of this
 //   convention.
 //
-CompiledMethod* ArtJniCompileMethodInternal(CompilerDriver& compiler,
+CompiledMethod* ArtJniCompileMethodInternal(CompilerDriver* driver,
                                             uint32_t access_flags, uint32_t method_idx,
                                             const DexFile& dex_file) {
   const bool is_native = (access_flags & kAccNative) != 0;
@@ -60,7 +60,7 @@
   const bool is_static = (access_flags & kAccStatic) != 0;
   const bool is_synchronized = (access_flags & kAccSynchronized) != 0;
   const char* shorty = dex_file.GetMethodShorty(dex_file.GetMethodId(method_idx));
-  InstructionSet instruction_set = compiler.GetInstructionSet();
+  InstructionSet instruction_set = driver->GetInstructionSet();
   if (instruction_set == kThumb2) {
     instruction_set = kArm;
   }
@@ -423,7 +423,7 @@
   std::vector<uint8_t> managed_code(cs);
   MemoryRegion code(&managed_code[0], managed_code.size());
   __ FinalizeInstructions(code);
-  return new CompiledMethod(compiler,
+  return new CompiledMethod(driver,
                             instruction_set,
                             managed_code,
                             frame_size,
@@ -536,7 +536,7 @@
 
 }  // namespace art
 
-extern "C" art::CompiledMethod* ArtQuickJniCompileMethod(art::CompilerDriver& compiler,
+extern "C" art::CompiledMethod* ArtQuickJniCompileMethod(art::CompilerDriver* compiler,
                                                          uint32_t access_flags, uint32_t method_idx,
                                                          const art::DexFile& dex_file) {
   return ArtJniCompileMethodInternal(compiler, access_flags, method_idx, dex_file);