Custom codegen for small frameless methods.

Added a general mechanism that will allow pattern matching of
small methods and (generally) frameless code generation.  Prevously,
all frames were at least 16 bytes, not you can have zero-length
frames (and thus some old asserts had to go).

Change-Id: Ic786940a602e25b48cbc317ac601ac84cc307762
diff --git a/src/compiler/codegen/CompilerCodegen.h b/src/compiler/codegen/CompilerCodegen.h
index 1137db3..8f854da 100644
--- a/src/compiler/codegen/CompilerCodegen.h
+++ b/src/compiler/codegen/CompilerCodegen.h
@@ -29,6 +29,9 @@
 /* Lower middle-level IR to low-level IR for the whole method */
 void oatMethodMIR2LIR(CompilationUnit* cUnit);
 
+/* Lower middle-level IR to low-level IR for the simple methods */
+void oatSpecialMIR2LIR(CompilationUnit* cUnit, SpecialCaseHandler specialCase );
+
 /* Assemble LIR into machine code */
 void oatAssembleLIR(CompilationUnit* cUnit);
 AssemblerStatus oatAssembleInstructions(CompilationUnit* cUnit,