[java] RFA: builtins vs. -findirect-dispatch

[Bryce McKinlay]

Currently, some of GCJ's Math builtins can generate non-indirect 
function calls even when -findirect-dispatch is set. The simplest fix 
for this seems to be to simply disable builtins where a function call 
could be generated and -findirect-dispatch in use. This shouldn't really 
effect performance for the general case, since these builtins usually 
seem to generate function calls anyway unless -ffast-math is in use. 
Other builtins like Math.min(), which never use a function call, will 
still work.

This is needed for the upcoming libgcj_bc patch, since that will ensure 
at link time that only known BC-ABI symbols are used by an 
-findirect-dispatch binary.

OK to commit?

Bryce

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