Seperate asmstring parsing from emission.  This allows the code to be simpler and more understandable.  It also allows us to do simple things like fold consequtive literal strings together.  For example, instead of emitting this for the X86 backend:
Seperate asmstring parsing from emission.  This allows the code to be simpler
and more understandable.  It also allows us to do simple things like fold
consequtive literal strings together.  For example, instead of emitting this
for the X86 backend:

  O  << "adc" << "l" << " ";

we now generate this:

  O << "adcl ";

*whoa* :)

This shrinks the X86 asmwriters from 62729->58267 and 65176->58644 bytes
for the intel/att asm writers respectively.


git-svn-id: a4a6f32337ebd29ad4763b423022f00f68d1c7b7@19749 91177308-0d34-0410-b5e6-96231b3b80d8

lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx