Several related changes:

1. Change several methods in the MachineCodeEmitter class to be pure virtual.
2. Suck emitConstantPool/initJumpTableInfo into startFunction, removing them
   from the MachineCodeEmitter interface, and reducing the amount of target-
   specific code.
3. Change the JITEmitter so that it allocates constantpools and jump tables
   *right* next to the functions that they belong to, instead of in a separate
   pool of memory.  This makes all memory for a function be contiguous, and
   means the JITEmitter only tracks one block of memory now.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28065 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Alpha/AlphaCodeEmitter.cpp

@@ -81,7 +81,6 @@ bool AlphaCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
     BasicBlockAddrs.clear();
     
     MCE.startFunction(MF);
-    MCE.emitConstantPool(MF.getConstantPool());
     for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
       emitBasicBlock(*I);
   } while (MCE.finishFunction(MF));