[BOLT] Avoid EH trampolines for PIEs/DSOs (#117106) We used to emit EH trampolines for PIE/DSO whenever a function fragment contained a landing pad outside of it. However, it is common to have all landing pads in a cold fragment even when their throwers are in a hot one. To reduce the number of trampolines, analyze landing pads for any given function fragment, and if they all belong to the same (possibly different) fragment, designate that fragment as a landing pad fragment for the "thrower" fragment. Later, emit landing pad fragment symbol as an LPStart for the thrower LSDA.
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