[Patch, AVR, longlong.h]: Implement __clrsbhi2.

[Georg-Johann Lay]

The new count leading signs is not implemented for HI:

builtin-bitops-1.c:(.text+0xd1e): undefined reference to `__clrsbhi2'
FAIL: gcc.c-torture/execute/builtin-bitops-1.c compilation,  -O0

Extended clz/ctz support in longlong.h

With the patch testcase passes.

Johann

libgcc/
	* config/avr/t-avr (intfuncs16): Add _clrsbXX2.

gcc/
	* longlong.h (count_leading_zeros, count_trailing_zeros,
	COUNT_LEADING_ZEROS_0): Define for target avr if W_TYPE_SIZE is 16
	resp. 64.
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