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_llvm/compiler_llvm.cc b/src/compiler_llvm/compiler_llvm.cc
index a0264fe..3ec5e68 100644
--- a/src/compiler_llvm/compiler_llvm.cc
+++ b/src/compiler_llvm/compiler_llvm.cc
@@ -283,10 +283,10 @@
   return result;
 }
 
-extern "C" art::CompiledInvokeStub* ArtCreateInvokeStub(art::Compiler& compiler,
-                                                        bool is_static,
-                                                        const char* shorty,
-                                                        uint32_t shorty_len) {
+extern "C" art::CompiledInvokeStub* ArtCreateLLVMInvokeStub(art::Compiler& compiler,
+                                                            bool is_static,
+                                                            const char* shorty,
+                                                            uint32_t shorty_len) {
   art::compiler_llvm::CompilerLLVM* compiler_llvm = ContextOf(compiler);
   art::CompiledInvokeStub* result = compiler_llvm->CreateInvokeStub(is_static, shorty);
   return result;