ggml : fix ggml_clamp

[ggerganov]

Overview

cont ggml-org/ggml#145

Fix failing test https://github.com/ggml-org/llama.cpp/actions/runs/32657742369/job/97239065076#step:5:12415. The problem is that the first op in the graph split (GGML_OP_CLAMP) ends up being inplace (due to legacy) on the CI Apple runners (due to limited op support):

node #269 (  SOFTPLUS):             node_269 (   1K) [ MTL0         ] use=1,c=1: MTL0#ffn_moe_logits- (   1K) [ NULL         ]
node #270 (      SQRT):      ffn_moe_probs-0 (   1K) [ MTL0         ] use=2,c=1:             node_269 (   1K) [ MTL0         ]
node #272 (       ADD): ffn_moe_probs_biased (   1K) [ MTL0         ] use=1,c=1:      ffn_moe_probs-0 (   1K) [ MTL0         ] blk.0.exp_probs_b.bi (   0K) [ MTL0         ]
node #273 (   ARGSORT):    ffn_moe_argsort-0 (   1K) [ MTL0         ] use=1,c=1: ffn_moe_probs_biased (   1K) [ MTL0         ]
node #275 (  GET_ROWS):    ffn_moe_weights-0 (   0K) [ MTL0         ] use=1,c=1: ffn_moe_probs-0 (res (   1K) [ MTL0         ]       ffn_moe_topk-0 (   0K) [ MTL0         ]

## SPLIT #33: CPU # 1 inputs: [ffn_moe_weights-0 (reshaped) (   0K)] 
node #277 (  SUM_ROWS): ffn_moe_weights_sum- (   0K) [  CPU         ] use=1,c=1: CPU#ffn_moe_weights- (   0K) [ NULL         ]

## SPLIT #34: MTL0 # 1 inputs: [ffn_moe_weights_sum-0 (   0K)] 
node #278 (     CLAMP): ffn_moe_weights_sum_ (   0K) [ MTL0         ] use=1,c=1: MTL0#ffn_moe_weights (   0K) [ NULL         ]
node #279 (       DIV): ffn_moe_weights_norm (   0K) [ MTL0         ] use=1,c=1: ffn_moe_weights-0 (r (   0K) [ MTL0         ] ffn_moe_weights_sum_ (   0K) [ MTL0         ]
node #281 (     SCALE): ffn_moe_weights_scal (   0K) [ MTL0         ] use=1,c=1: ffn_moe_weights_norm (   0K) [ MTL0         ]

Requirements

• I have read and agree with the contributing guidelines
• AI usage disclosure: NO

[CISC]

Should it not be added to this too?

llama.cpp/ggml/src/ggml-alloc.c

Lines 21 to 23 in c060ca9

	// ops that return true for this function must not use restrict pointers for their backend implementations
	bool ggml_op_can_inplace(enum ggml_op op) {
	switch (op) {