ash: introduce bash-like $FUNCNAME

Patch adapted from Roberto A. Foglietta <roberto.foglietta@gmail.com>
work.

function                                             old     new   delta
lookupvar                                            106     150     +44
evalfun                                              369     408     +39
ash_main                                            1218    1242     +24
varinit_data                                         156     168     +12
.rodata                                           104162  104172     +10
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(add/remove: 0/0 grow/shrink: 5/0 up/down: 129/0)             Total: 129 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
1 file changed