[PATCH] XCore target: use TEST_TARGET_FLAGS to override target's memory size.

[Daniel Dunbar]

  What I meant was can't you set a variable like

  XCORE_TARGET_NEEDS_MEMORY := 32

  for individual tests, and then if that variable is defined add the custom
  linker logic (in one of the common Makefile fragments)?

   - Daniel

http://llvm-reviews.chandlerc.com/D3048