Quick compiler: Single .so for all targets

With this CL, all targets can be built into a single .so (but
we're not yet doing so - the compiler driver needs to be reworked).

A new Codgen class is introduced (see compiler/codegen/codegen.h),
along with target-specific sub-classes ArmCodegen, MipsCodegens and
X86Codegen (see compiler/codegen/*/codegen_[Arm|Mips|X86].h).

Additional minor code, comment and format refactoring.  Some source
files combined, temporary header files deleted and a few file
renames to better identify their function.

Next up is combining the Quick and Portable .so files.

Note: building all targets into libdvm-compiler.so increases its
size by 140K bytes.  I'm inclined to not bother introducing conditional
compilation to limit code to the specific target - the added build and
testing complexity doesn't doesn't seem worth such a modest size savings.

Change-Id: Id9c5b4502ad6b77cdb31f71d3126f51a4f2e9dfe
diff --git a/src/compiler/frontend.h b/src/compiler/frontend.h
index f7e76f8..fb32cdd 100644
--- a/src/compiler/frontend.h
+++ b/src/compiler/frontend.h
@@ -49,7 +49,7 @@
  */
 #define MAX_ASSEMBLER_RETRIES 50
 
-/* Suppress optimization if corresponding bit set */
+// Suppress optimization if corresponding bit set.
 enum opt_control_vector {
   kLoadStoreElimination = 0,
   kLoadHoisting,
@@ -64,7 +64,7 @@
   kPromoteCompilerTemps,
 };
 
-/* Force code generation paths for testing */
+// Force code generation paths for testing.
 enum debugControlVector {
   kDebugDisplayMissingTargets,
   kDebugVerbose,
@@ -86,14 +86,14 @@
 };
 
 enum OatMethodAttributes {
-  kIsCallee = 0,      /* Code is part of a callee (invoked by a hot trace) */
-  kIsHot,             /* Code is part of a hot trace */
-  kIsLeaf,            /* Method is leaf */
-  kIsEmpty,           /* Method is empty */
-  kIsThrowFree,       /* Method doesn't throw */
-  kIsGetter,          /* Method fits the getter pattern */
-  kIsSetter,          /* Method fits the setter pattern */
-  kCannotCompile,     /* Method cannot be compiled */
+  kIsCallee = 0,      // Code is part of a callee (invoked by a hot trace).
+  kIsHot,             // Code is part of a hot trace.
+  kIsLeaf,            // Method is leaf.
+  kIsEmpty,           // Method is empty.
+  kIsThrowFree,       // Method doesn't throw.
+  kIsGetter,          // Method fits the getter pattern.
+  kIsSetter,          // Method fits the setter pattern.
+  kCannotCompile,     // Method cannot be compiled.
 };
 
 #define METHOD_IS_CALLEE        (1 << kIsCallee)
@@ -128,7 +128,7 @@
 
   private:
     UniquePtr<llvm::LLVMContext> llvm_context_;
-    llvm::Module* llvm_module_; // Managed by context_
+    llvm::Module* llvm_module_; // Managed by context_.
     UniquePtr<art::greenland::IntrinsicHelper> intrinsic_helper_;
     UniquePtr<art::greenland::IRBuilder> ir_builder_;
 };