[LLVMdev] Declarations for libcalls.

[Sanjiv Gupta]

Our assembler requires that the external functions used in a module 
should explicitly be declared using "extern" directive.
The llvm libcall infrastructure doesn't keep a list of libcalls made for 
the module, though they are available as part of the list of all 
external symbols used by the module. Is it a good idea to keep the list 
of libcalls separate?

- Sanjiv