Account for inline assembly instructions in inlining cost. (#146628) Inliner currently treats every "call asm" IR instruction as a single instruction regardless of how many instructions the inline assembly may contain. This may underestimate the cost of inlining for a callee containing long inline assembly. Besides, we may need to assign a higher cost to instructions in inline assembly since they cannot be analyzed and optimized by the compiler. This PR introduces a new option `-inline-asm-instr-cost` -- set zero by default, which can control the cost of inline assembly instructions in inliner's cost-benefit analysis.
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